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Pagedown
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How to calculate the efficiency of an amplifier e.g. op-amp? Been thinking about that, and have no answer. It should not be Vout / Vin ?
Pagedown said:So shouldn't be the audio amplifity efficiency more than 1 since its driving power?(generating greater signals)
I know its not, but just don't know how to prove in mathematically. So usually current output is very low although voltage is high? Something like transformer?
Pagedown said:Okay, I have reading on those definitions, but no clue of calculating the efficiency of the opamp yet.
Simply, all I need is just an example calculation of the efficiency of an amplifier circuit.
Pagedown said:For an example, a non-inverting op-amp. It has +5v and -5v input power supplies. Thus is 10Vx Iin(input current) in power. Say 100mA max current.Power out should be 1W.
If 1V input is given to the inputs of the opamp, with voltage gain configuration of 100, thus output voltage is 100. Say load is 100 ohm. Thus power out should be 100W.
I know this is wrong, but i duno how to calculate in the right way.
Thanks for the guidance and time you all make for me. =)
P.S - must we use root mean square always when calculating power? It means average power right? Why is it always root mean square, and sometimes square root of 3 for 3 phase.. that is another question popping on my head..
The formula for calculating amplifier efficiency is: Efficiency = (Output Power/Input Power) x 100%. This means that the efficiency is the ratio of the output power to the input power, expressed as a percentage.
The output power of an amplifier can be measured using a power meter or a multimeter. The power meter is more accurate and can directly measure the output power, while a multimeter can measure the voltage and current and then calculate the power using the formula P = V x I.
No, the efficiency of an amplifier cannot be greater than 100%. This would mean that the output power is greater than the input power, which violates the law of conservation of energy.
There are a few ways to improve the efficiency of an amplifier, such as using high-quality components, matching the input and output impedance, and using proper biasing techniques. Additionally, using a switching amplifier design can also significantly increase efficiency.
The efficiency of an amplifier can vary greatly depending on its design and purpose. Generally, a good efficiency range for an amplifier is between 50-70%, but some high-end amplifiers can have efficiencies as high as 90%. It is important to consider the efficiency in relation to the specific needs and requirements of the amplifier's application.