+ Post New Thread
Results 1 to 7 of 7

24th May 2007, 06:58 #1
 Join Date
 Apr 2004
 Location
 Singapore
 Posts
 278
 Helped
 3 / 3
 Points
 3,193
 Level
 13
ac power consumption calculation
If I have a number of opamps on a circuit, how do I calculate the power consumption? Do I consider only the quiescent current?
Thanks,
Eric

24th May 2007, 06:58

26th May 2007, 10:27 #2
 Join Date
 Oct 2005
 Location
 India
 Posts
 1,804
 Helped
 259 / 259
 Points
 17,526
 Level
 32
how to calculate ac power consumption
it depends on the circuit u r using.... in dc it is easy but when the signal or intermediate signals are ac then the power consumption will vary.... in dc the current supplied by the power supply can be used to easily find the power consumption...

26th May 2007, 10:27

26th May 2007, 14:06 #3
calculate ac power consumption
Connect a ammeter in series with the circuit and measure the current. Measure the supply voltage. Multiply current and voltage to calculate power consumption.

26th May 2007, 14:06

27th May 2007, 16:55 #4
 Join Date
 Jul 2006
 Posts
 266
 Helped
 23 / 23
 Points
 3,518
 Level
 13
calculate power consumption
dc power dissipiation will be higher than that of ac, since usually the ac voltages are very less even at the output.
to find your output power dissipiated, measure the voltage across which you take the output and multiply it by the current flowing through the output terminal.

28th May 2007, 11:00 #5
 Join Date
 May 2007
 Posts
 36
 Helped
 2 / 2
 Points
 1,206
 Level
 7
circuit power consumption calculation
If the supplies are same to all the opamps simply measure the voltage and current across the maiin supply. multiply them to get the power. AC part i think u can neglet it.

28th May 2007, 11:00

29th May 2007, 08:15 #6
 Join Date
 Apr 2001
 Posts
 142
 Helped
 6 / 6
 Points
 3,169
 Level
 13
how to calculate power consumption of ac
do u know to operate multimeter? Then it is easy to measure. Normally there is ampere measuring included in multimeter. U can then check the operating manual of multimeter & it will show how to measure current.
Then voltage x current = watts.

2nd June 2007, 16:50 #7
 Join Date
 Oct 2005
 Location
 South Africa
 Posts
 296
 Helped
 27 / 27
 Points
 2,850
 Level
 12
how to calculate power consumption
By measuring the currents and voltages you are not calculating the power consumption. I think the easiest way to calculate the power consumption is by detailed analysis of the various circuit elements. If a simulator is available this might be suitable for your purposes.
Cheers
Slayer
+ Post New Thread
Please login