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Old 07-10-2009, 12:43 AM
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Default Measuring Power

Measuring Power

Power Consumption is Direct Current “DC”

Audio Output is Alternating Current “AC”

The same calculations work for both DC and AC power measurement but you have to keep the units consistent!

Using DC readings in an AC calculation does not work and will be completely inaccurate.


Power Consumption is Direct Current
Measure the power you are using by taking DC amp and DC volt readings on the power lead and using calculations to figure out watts used.

Audio Output is Alternating Current
Measure the power you are producing by taking AC amp and AC volt readings on the speaker leads and using calculations to figure out watts produced.

Both calculations result in Watts

Efficiency is measured in percentage
You can calculate your amplifiers percentage of efficiency by dividing the total watts produced by the total watts used.

Amps times Volts equals Watts
I * E = P
Example: 100 DC amps * 14.4 DC volts = 1440 watts
Example: 13.58 AC amps * 53.0 AC volts = 720 watts

Watts produced divided by Watts consumed equals the decimal equivalent to the percentage of efficiency.
Example: 720 watts / 1440 watts = 0.50 = 50% efficiency



Terms and the corresponding letters used for abberviation in calculation:
I Amperes
E Voltage
P Power
R Resistance
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