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Transcript PILE21CQ1.2004062914..

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.