Explanation:
An electric motor is a device that utilizes the magnetic effect of electric current. When a current-carrying coil is placed in a magnetic field, it experiences a force (Fleming's Left-Hand Rule) that causes it to rotate. Therefore, it continuously converts electrical energy into mechanical energy. A generator does the reverse.
Explanation:
U ∝ V². If V' = 2V, U' = 4U. Energy scales with square of voltage. Memory aid: 'Capacitor energy: U ∝ V²; double voltage ⇒ quadruple energy'. Electrostatics proportionality frequently tested in competitive exams.
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