2006-11-11 03:43:22 · 4 answers · asked by Jesus is the Lord ! 2 in Science & Mathematics ➔ Engineering
To give an example, a transformer could be a voltage amplifier, but the power would remain constant. A power amplifier may or may not change the voltage, but increases the amount of overall power. As you can imagine, the input and output impedances must be properly matched for all these examples.
2006-11-11 03:53:49 · answer #1 · answered by rscanner 6 · 0⤊ 0⤋
A power amplifier is an amplifier producing the required output power of a system, usually being the final amplification stage.
A voltage amplifier is designed to amplify voltage waveforms in applications where very little power is taken from the load.
2006-11-11 03:57:21 · answer #2 · answered by Scabius Fretful 5 · 0⤊ 0⤋
P = V*I, where P is power in watts, V is voltage in volts, and I is current in amps. (from source)
In a voltage amplifier, the output voltage amplitude is larger than the input voltage.
In a power amplifier, the output power is larger than the input power.
So in some cases you can have large power gain (P_out/P_in) without much voltage gain (V_out/V_in), and in other cases you might have higher voltage gain than power gain.
2006-11-11 11:58:04 · answer #3 · answered by Too much junk 1 · 0⤊ 0⤋
first amplifies power and later amplifies voltage.
This is mazor difference and i dont talk minor differences. Leave it.
2006-11-11 05:15:57 · answer #4 · answered by Anonymous · 0⤊ 0⤋