What is the meaning when we say power of circuit having a clock frequency 100Hz is 2W?












2












$begingroup$


When we say clock frequency is 100Hz, then there are 100 clock pulses in one second. So when we say power is 2W, is it 2W for 100 cycles or one cycle ? Or is it anything else?






power digital-logic clock







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$endgroup$








  • 4




    $begingroup$
    I'm not sure I understand what you're asking, but 2W would be an average quantity.
    $endgroup$
    – Hearth
    yesterday






  • 1




    $begingroup$
    A watt = 1 Joule per second. Two watts means it is using two joules per second.
    $endgroup$
    – J...
    yesterday












  • $begingroup$
    Could you clarify what kind of circuit you are asking about? Something like a microcontroller will have a power use that increases with the clock frequency, however, 100 Hz is a very low frequency for a microcontroller so people so far are answering a different question...
    $endgroup$
    – nitro2k01
    yesterday
















2












$begingroup$


When we say clock frequency is 100Hz, then there are 100 clock pulses in one second. So when we say power is 2W, is it 2W for 100 cycles or one cycle ? Or is it anything else?






power digital-logic clock







share|improve this question









$endgroup$








  • 4




    $begingroup$
    I'm not sure I understand what you're asking, but 2W would be an average quantity.
    $endgroup$
    – Hearth
    yesterday






  • 1




    $begingroup$
    A watt = 1 Joule per second. Two watts means it is using two joules per second.
    $endgroup$
    – J...
    yesterday












  • $begingroup$
    Could you clarify what kind of circuit you are asking about? Something like a microcontroller will have a power use that increases with the clock frequency, however, 100 Hz is a very low frequency for a microcontroller so people so far are answering a different question...
    $endgroup$
    – nitro2k01
    yesterday














2












2








2





$begingroup$


When we say clock frequency is 100Hz, then there are 100 clock pulses in one second. So when we say power is 2W, is it 2W for 100 cycles or one cycle ? Or is it anything else?






power digital-logic clock







share|improve this question









$endgroup$




When we say clock frequency is 100Hz, then there are 100 clock pulses in one second. So when we say power is 2W, is it 2W for 100 cycles or one cycle ? Or is it anything else?






power digital-logic clock




power digital-logic clock






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked yesterday









StudentStudent

1192




1192








  • 4




    $begingroup$
    I'm not sure I understand what you're asking, but 2W would be an average quantity.
    $endgroup$
    – Hearth
    yesterday






  • 1




    $begingroup$
    A watt = 1 Joule per second. Two watts means it is using two joules per second.
    $endgroup$
    – J...
    yesterday












  • $begingroup$
    Could you clarify what kind of circuit you are asking about? Something like a microcontroller will have a power use that increases with the clock frequency, however, 100 Hz is a very low frequency for a microcontroller so people so far are answering a different question...
    $endgroup$
    – nitro2k01
    yesterday














  • 4




    $begingroup$
    I'm not sure I understand what you're asking, but 2W would be an average quantity.
    $endgroup$
    – Hearth
    yesterday






  • 1




    $begingroup$
    A watt = 1 Joule per second. Two watts means it is using two joules per second.
    $endgroup$
    – J...
    yesterday












  • $begingroup$
    Could you clarify what kind of circuit you are asking about? Something like a microcontroller will have a power use that increases with the clock frequency, however, 100 Hz is a very low frequency for a microcontroller so people so far are answering a different question...
    $endgroup$
    – nitro2k01
    yesterday








4




4




$begingroup$
I'm not sure I understand what you're asking, but 2W would be an average quantity.
$endgroup$
– Hearth
yesterday




$begingroup$
I'm not sure I understand what you're asking, but 2W would be an average quantity.
$endgroup$
– Hearth
yesterday




1




1




$begingroup$
A watt = 1 Joule per second. Two watts means it is using two joules per second.
$endgroup$
– J...
yesterday






$begingroup$
A watt = 1 Joule per second. Two watts means it is using two joules per second.
$endgroup$
– J...
yesterday














$begingroup$
Could you clarify what kind of circuit you are asking about? Something like a microcontroller will have a power use that increases with the clock frequency, however, 100 Hz is a very low frequency for a microcontroller so people so far are answering a different question...
$endgroup$
– nitro2k01
yesterday




$begingroup$
Could you clarify what kind of circuit you are asking about? Something like a microcontroller will have a power use that increases with the clock frequency, however, 100 Hz is a very low frequency for a microcontroller so people so far are answering a different question...
$endgroup$
– nitro2k01
yesterday










4 Answers
4






active

oldest

votes


















6












$begingroup$

Power is energy per time. It is up to you to define a time interval.



But usually we are talking about mean or effective power of a sine wave, which defines the time interval to be one or multiple full periods of the sine.






share|improve this answer









$endgroup$





















    4












    $begingroup$

    An average power of 2 watts means 2 joules of energy per second. If you sub-divided this up into smaller time slots (i.e. 10 ms thus corresponding to a 100 time slots per second) the energy would be 0.02 joules per 10 ms. This is still a power of 2 watts because 0.02 joules divided by 0.01 seconds = 2 watts.






    share|improve this answer









    $endgroup$





















      3












      $begingroup$

      Full wave Rectifiers are one way to produce 100 Hz from 50Hz but this can be done in microwatts. So power and frequency do not need to be relevant but might for some motor.



      Power “may” be measured;




      • in Zero Time as a sample

      • or an Average , or a Peak or RMS value

      • or in complex form X+jY or Real, and Reactive

      • or Apparent power the hypotenuse of the above

      • or in some trig form A (cos wt)+B

      • or estimated average power

      • or true RMS power as DC power = RMS AC power


      Power has no Units of time, unless as additional information to compute Energy in watt-hours [Wh] or watt-seconds = Joules [J]






      share|improve this answer









      $endgroup$





















        2












        $begingroup$

        i recall using a 9 amp Power Driver for MOSFET gates. The shoot-thru charge, during the 10 nanoseconds of internal slewing of control voltage, was rated in nanoCoulombs. Assume this was 5amps (mid-rail) for 10 nanosecond, or 50 nanoCoulombs. At 15 volts on the IC, the energy was 750 nanoJoules per transition, either going-positive or going-negative.
        Thus a complete cycle was 1.5 microJoules. We used 0.1uF bypass caps, with 1cm leads, on the breadboards, and tolerated the constant 0.5 volt rail sag and the scary ringing.



        At 1,000,000 cycles per second (Hertz) the internal power dissipation was 1.5 watts.



        You could buy these parts in DIP (and 1.5 watts is a LOT of power, for a DIP) or buy a TO-220 with a 1cm by 2cm copper tab you could BOLT to a heatsink.



        I (and my team) quickly learned to only use the TO-220 in our prototypes, with a small fan pushing air onto the hot tab.






        share|improve this answer









        $endgroup$













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          4 Answers
          4






          active

          oldest

          votes








          4 Answers
          4






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          6












          $begingroup$

          Power is energy per time. It is up to you to define a time interval.



          But usually we are talking about mean or effective power of a sine wave, which defines the time interval to be one or multiple full periods of the sine.






          share|improve this answer









          $endgroup$


















            6












            $begingroup$

            Power is energy per time. It is up to you to define a time interval.



            But usually we are talking about mean or effective power of a sine wave, which defines the time interval to be one or multiple full periods of the sine.






            share|improve this answer









            $endgroup$
















              6












              6








              6





              $begingroup$

              Power is energy per time. It is up to you to define a time interval.



              But usually we are talking about mean or effective power of a sine wave, which defines the time interval to be one or multiple full periods of the sine.






              share|improve this answer









              $endgroup$



              Power is energy per time. It is up to you to define a time interval.



              But usually we are talking about mean or effective power of a sine wave, which defines the time interval to be one or multiple full periods of the sine.







              share|improve this answer












              share|improve this answer



              share|improve this answer










              answered yesterday









              Stefan WyssStefan Wyss

              2,0931313




              2,0931313

























                  4












                  $begingroup$

                  An average power of 2 watts means 2 joules of energy per second. If you sub-divided this up into smaller time slots (i.e. 10 ms thus corresponding to a 100 time slots per second) the energy would be 0.02 joules per 10 ms. This is still a power of 2 watts because 0.02 joules divided by 0.01 seconds = 2 watts.






                  share|improve this answer









                  $endgroup$


















                    4












                    $begingroup$

                    An average power of 2 watts means 2 joules of energy per second. If you sub-divided this up into smaller time slots (i.e. 10 ms thus corresponding to a 100 time slots per second) the energy would be 0.02 joules per 10 ms. This is still a power of 2 watts because 0.02 joules divided by 0.01 seconds = 2 watts.






                    share|improve this answer









                    $endgroup$
















                      4












                      4








                      4





                      $begingroup$

                      An average power of 2 watts means 2 joules of energy per second. If you sub-divided this up into smaller time slots (i.e. 10 ms thus corresponding to a 100 time slots per second) the energy would be 0.02 joules per 10 ms. This is still a power of 2 watts because 0.02 joules divided by 0.01 seconds = 2 watts.






                      share|improve this answer









                      $endgroup$



                      An average power of 2 watts means 2 joules of energy per second. If you sub-divided this up into smaller time slots (i.e. 10 ms thus corresponding to a 100 time slots per second) the energy would be 0.02 joules per 10 ms. This is still a power of 2 watts because 0.02 joules divided by 0.01 seconds = 2 watts.







                      share|improve this answer












                      share|improve this answer



                      share|improve this answer










                      answered yesterday









                      Andy akaAndy aka

                      241k11180413




                      241k11180413























                          3












                          $begingroup$

                          Full wave Rectifiers are one way to produce 100 Hz from 50Hz but this can be done in microwatts. So power and frequency do not need to be relevant but might for some motor.



                          Power “may” be measured;




                          • in Zero Time as a sample

                          • or an Average , or a Peak or RMS value

                          • or in complex form X+jY or Real, and Reactive

                          • or Apparent power the hypotenuse of the above

                          • or in some trig form A (cos wt)+B

                          • or estimated average power

                          • or true RMS power as DC power = RMS AC power


                          Power has no Units of time, unless as additional information to compute Energy in watt-hours [Wh] or watt-seconds = Joules [J]






                          share|improve this answer









                          $endgroup$


















                            3












                            $begingroup$

                            Full wave Rectifiers are one way to produce 100 Hz from 50Hz but this can be done in microwatts. So power and frequency do not need to be relevant but might for some motor.



                            Power “may” be measured;




                            • in Zero Time as a sample

                            • or an Average , or a Peak or RMS value

                            • or in complex form X+jY or Real, and Reactive

                            • or Apparent power the hypotenuse of the above

                            • or in some trig form A (cos wt)+B

                            • or estimated average power

                            • or true RMS power as DC power = RMS AC power


                            Power has no Units of time, unless as additional information to compute Energy in watt-hours [Wh] or watt-seconds = Joules [J]






                            share|improve this answer









                            $endgroup$
















                              3












                              3








                              3





                              $begingroup$

                              Full wave Rectifiers are one way to produce 100 Hz from 50Hz but this can be done in microwatts. So power and frequency do not need to be relevant but might for some motor.



                              Power “may” be measured;




                              • in Zero Time as a sample

                              • or an Average , or a Peak or RMS value

                              • or in complex form X+jY or Real, and Reactive

                              • or Apparent power the hypotenuse of the above

                              • or in some trig form A (cos wt)+B

                              • or estimated average power

                              • or true RMS power as DC power = RMS AC power


                              Power has no Units of time, unless as additional information to compute Energy in watt-hours [Wh] or watt-seconds = Joules [J]






                              share|improve this answer









                              $endgroup$



                              Full wave Rectifiers are one way to produce 100 Hz from 50Hz but this can be done in microwatts. So power and frequency do not need to be relevant but might for some motor.



                              Power “may” be measured;




                              • in Zero Time as a sample

                              • or an Average , or a Peak or RMS value

                              • or in complex form X+jY or Real, and Reactive

                              • or Apparent power the hypotenuse of the above

                              • or in some trig form A (cos wt)+B

                              • or estimated average power

                              • or true RMS power as DC power = RMS AC power


                              Power has no Units of time, unless as additional information to compute Energy in watt-hours [Wh] or watt-seconds = Joules [J]







                              share|improve this answer












                              share|improve this answer



                              share|improve this answer










                              answered yesterday









                              Sunnyskyguy EE75Sunnyskyguy EE75

                              65.8k22396




                              65.8k22396























                                  2












                                  $begingroup$

                                  i recall using a 9 amp Power Driver for MOSFET gates. The shoot-thru charge, during the 10 nanoseconds of internal slewing of control voltage, was rated in nanoCoulombs. Assume this was 5amps (mid-rail) for 10 nanosecond, or 50 nanoCoulombs. At 15 volts on the IC, the energy was 750 nanoJoules per transition, either going-positive or going-negative.
                                  Thus a complete cycle was 1.5 microJoules. We used 0.1uF bypass caps, with 1cm leads, on the breadboards, and tolerated the constant 0.5 volt rail sag and the scary ringing.



                                  At 1,000,000 cycles per second (Hertz) the internal power dissipation was 1.5 watts.



                                  You could buy these parts in DIP (and 1.5 watts is a LOT of power, for a DIP) or buy a TO-220 with a 1cm by 2cm copper tab you could BOLT to a heatsink.



                                  I (and my team) quickly learned to only use the TO-220 in our prototypes, with a small fan pushing air onto the hot tab.






                                  share|improve this answer









                                  $endgroup$


















                                    2












                                    $begingroup$

                                    i recall using a 9 amp Power Driver for MOSFET gates. The shoot-thru charge, during the 10 nanoseconds of internal slewing of control voltage, was rated in nanoCoulombs. Assume this was 5amps (mid-rail) for 10 nanosecond, or 50 nanoCoulombs. At 15 volts on the IC, the energy was 750 nanoJoules per transition, either going-positive or going-negative.
                                    Thus a complete cycle was 1.5 microJoules. We used 0.1uF bypass caps, with 1cm leads, on the breadboards, and tolerated the constant 0.5 volt rail sag and the scary ringing.



                                    At 1,000,000 cycles per second (Hertz) the internal power dissipation was 1.5 watts.



                                    You could buy these parts in DIP (and 1.5 watts is a LOT of power, for a DIP) or buy a TO-220 with a 1cm by 2cm copper tab you could BOLT to a heatsink.



                                    I (and my team) quickly learned to only use the TO-220 in our prototypes, with a small fan pushing air onto the hot tab.






                                    share|improve this answer









                                    $endgroup$
















                                      2












                                      2








                                      2





                                      $begingroup$

                                      i recall using a 9 amp Power Driver for MOSFET gates. The shoot-thru charge, during the 10 nanoseconds of internal slewing of control voltage, was rated in nanoCoulombs. Assume this was 5amps (mid-rail) for 10 nanosecond, or 50 nanoCoulombs. At 15 volts on the IC, the energy was 750 nanoJoules per transition, either going-positive or going-negative.
                                      Thus a complete cycle was 1.5 microJoules. We used 0.1uF bypass caps, with 1cm leads, on the breadboards, and tolerated the constant 0.5 volt rail sag and the scary ringing.



                                      At 1,000,000 cycles per second (Hertz) the internal power dissipation was 1.5 watts.



                                      You could buy these parts in DIP (and 1.5 watts is a LOT of power, for a DIP) or buy a TO-220 with a 1cm by 2cm copper tab you could BOLT to a heatsink.



                                      I (and my team) quickly learned to only use the TO-220 in our prototypes, with a small fan pushing air onto the hot tab.






                                      share|improve this answer









                                      $endgroup$



                                      i recall using a 9 amp Power Driver for MOSFET gates. The shoot-thru charge, during the 10 nanoseconds of internal slewing of control voltage, was rated in nanoCoulombs. Assume this was 5amps (mid-rail) for 10 nanosecond, or 50 nanoCoulombs. At 15 volts on the IC, the energy was 750 nanoJoules per transition, either going-positive or going-negative.
                                      Thus a complete cycle was 1.5 microJoules. We used 0.1uF bypass caps, with 1cm leads, on the breadboards, and tolerated the constant 0.5 volt rail sag and the scary ringing.



                                      At 1,000,000 cycles per second (Hertz) the internal power dissipation was 1.5 watts.



                                      You could buy these parts in DIP (and 1.5 watts is a LOT of power, for a DIP) or buy a TO-220 with a 1cm by 2cm copper tab you could BOLT to a heatsink.



                                      I (and my team) quickly learned to only use the TO-220 in our prototypes, with a small fan pushing air onto the hot tab.







                                      share|improve this answer












                                      share|improve this answer



                                      share|improve this answer










                                      answered yesterday









                                      analogsystemsrfanalogsystemsrf

                                      14.3k2717




                                      14.3k2717






























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