What is the efficiency of a DC generator that requires 200 WS of energy to supply 160 watts of output power?

The efficiency of a DC generator can be calculated using the formula: Efficiency (%) = (Output Power / Input Energy) × 100. In this case, the input energy is 200 WS, and the output power is 160 watts. To find the efficiency, we first convert the input energy into power by considering the time duration; assuming the input energy is supplied over one second, the input power is also 200 watts. Thus, the efficiency is (160 W / 200 W) × 100 = 80%.