IGNOU BPHET 143 2026 - How class B amplifier is more efficient than class A amplifier? What w

Question

How class B amplifier is more efficient than class A amplifier? What will be the effect on the output of a push-pull amplifier if unmatched transistors are used?

19 Jan 2026

Answer :

Word Count : 268

Class B amplifiers are more efficient than Class A amplifiers because in Class B operation, each transistor conducts for only half of the input signal cycle (180°), whereas in Class A, the transistor conducts for the entire 360° of the cycle. This significantly reduces the power wasted as heat in the transistor, as no current flows through the device when there is no input signal, unlike Class

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