(a) What does the figure given below show?

(b) Which principle is used in this device
(c) State its uses

Hint:Electric motors provide torque (linear or rotational force) that is used to move an external mechanism such as a fan or an elevator. Electric motors are often built for continuous rotation or linear movement over a large distance given their size. Magnetic solenoids are likewise transducers that transfer electrical power to mechanical motion, but they have a restricted range of motion.

Complete answer:
(a) Following figure shows an Electric motor. An electric motor is a mechanism that transforms electricity into mechanical energy. The interaction between the motor's magnetic field and electric current in a wire winding generates force in the form of torque delivered to the motor's shaft in most electric motors. Direct current (DC) sources, such as batteries or rectifiers, or alternating current (AC) sources, such as a power grid, inverters, or electrical generators, can power electric motors. An electric generator is technically equivalent to an electric motor, but it converts mechanical energy into electrical energy using a reversed flow of power.

(b) The electric motor operates on the concept of current magnetic effects. It works on the basis that when a rectangular coil is put in a magnetic field and electricity is fed through it, the coil spins due to the forces acting on it.

(c) Electric motors are utilised for a wide range of purposes. The following is a list of some of them:
-Drills.
-Hard Disc Drives, Water Pumps
-Machines for washing clothes.
-Industrial machinery.
The remaining energy is lost in heat generation and sound emitted, thus a functional motor's efficiency should be about 70–85 percent.

Note:Electric motors provide torque (linear or rotational force) that is used to move an external mechanism such as a fan or an elevator. Electric motors are often built for continuous rotation or linear movement over a large distance given their size. Magnetic solenoids are likewise transducers that transfer electrical power to mechanical motion, but they have a restricted range of motion.