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21.3 Transformer Challenging questions A student says that he can generate electricity without fuel. He arranges a motor to run a generator. The output of the generator is stepped up with a transformer. Part of the output voltage of the transformer is used to power the motor and the other is used to power other electrical appliances. Do you think his idea works? No. Although the voltage is stepped up, the output power of the transformer can never be greater than the input power.