Question

What is true for an transistor as an Amplifier?

• A. It amplifies the power of varying current or alternating current
• B. It reduces the power of varying current or alternating current
• C. It amplifies the power of resistor
• D. It reduces the power of resistors

Answer 1

The correct option is A It amplifies the power of varying current or alternating current

1. An amplifier is an electronic device that increase the power of a signal(a time varying voltage or current).

2. The amplifier difference between the input and output signal is known as the gain of the amplifier.

3. Gain is basically a measure of how much an amplifier "amplifies the input signal".

4. There are three different kinds of amplifier gain which can be measured and theses are- Voltage gain$\left(A_V\right)$, Current gain $\left(A_i\right)$ and power gain $\left(A_p\right)$

5. So, it is clear that when a transistor is used as a amplifier it amplifies the power of varying current or alternating current.