engineering recuitment ISRO Scientist Electronics Mock Test Analog Electronics Power Amplifiers and 555 Timer and Voltage Regulators Power Amplifier
A power amplifier delivers 25 W of ac power to a 4 Ω speaker load. If the dc input power is 40 W, what is the efficiency of this amplifier?
1
78.6%
2
25%
3
62.5%
4
160%