State the principle of an electric generator.
An electric generator works on the principle of electromagnetic induction. When the magnetic field around a conductor is changed, the generation of electric current happens in a circuit, this phenomenon is called electromagnetic induction. When we rotate a coil in a magnetic field a current is induced in the coil (the circuit of the coil must be closed to utilise the current). The direction of the induced current is given by Fleming's right-hand rule.