Question

As voltage amplifier amplifies voltage then power amplifier really amplifies power or not?

Answer 1

A power amplifier amplifies power, but it doesn't mean that there is more energy. That would be against the conservation of energy.
We do know that for biasing, DC supplies are used. Some of the DC power gets converted to AC power and that's how we get Power Amplification

Answer 2

then why we call it power amplifier?
not a inverter

Answer 3

Cause we have an input AC source with low power and we get large output power, that's why the term power amplification.

Answer 4

so physically it converts DC power to AC power
is it right?

Answer 5

Inverters convert DC to AC
but in Power amplifiers an i/p source with low power is amplified to large power.

Answer 6

Not directly
We use transistors in amplifiers, they need DC biasing for working.
Our i/p signal gets amplified by the transistor ( or any non linear device)

Answer 7

so physically what would amplified?
voltage, current or power

Answer 8

both?

Answer 9

Power=voltage * current
voltage and current get amplified

Answer 10

It may depend on the class but for a power amplifier, power the product of two will get amplified for certain

Answer 11

ok thanks

Answer 12

you're welcome, did you get my point?

Answer 13

yes
we amplify voltage and current together
is it right?

Answer 14

yes

Answer 15

thanks again

Answer 16

welcome:D