Question

Give two similarities between an A.C. generator and a D.C. motor.

Answer 1

D.C. motor is the device which converts electrical energy to mechanical energy and A.C. generator is a device that converts electrical energy to mechanical energy.
They have some major differences although having some similarities.

Complete step-by-step answer:
Two similarities between A.C. generator and D.C. motor is given by:
1. In the working, they both use strong horseshoe magnets.
2. Both of them have an armature coil with a soft iron core.

Additional information:
Though A.C. generator and D.C. motor have some similarities, they have some major differences too. The differences are given below:

A.C. Generator	D.C. Motor
i) It converts mechanical energy to electrical energy.	i) It converts electrical energy to mechanical energy.
ii) Its working is based on the principle of electromagnetic induction.	ii) Its working is based on the concept of the force on a current carrying conductor.
iii) It uses two separate slip rings.	iii) It uses two parts of a split ring which act as a commutator.

Note: A.C. generator produces alternating current. A changing magnetic flux is required to induce current in the A.C. generator. In the A.C. generator power loss is minimum and it is economically more effective than D.C. The produced alternating current can be easily converted to D.C. using a rectifier. But, as the ac shock is attractive, AC is more dangerous than DC.
The A.C generator and D.C motor must be studied simultaneously by the students to understand the differences and similarities in their working.