Question

Which instrument is not used to convert electrical energy into heat energy?
A. Room heater
B. Electric iron
C. Electric Bell
D. Electric water heater

Answer 1

The electric current is passed through a conductor. There will be a generation of heat due to the hindrance caused due to the current flow. To overcome the hindrance the work done generated the heat in the particular conductor.

Complete step-by-step answer:
We know that the Room heater is the instrument that uses electric energy and converts it in heat energy to change the temperature of the room.
In-room heaters, coil or panel is used for heating effect. When this coil or panel is heated electrically it glows and heat is spread inside the room.
An electric iron is an instrument that uses electric energy and converts it into heat energy and when rubbed on clothes make it smooth.
Electric ironworks on the principle that when a current is passed through a piece of the wire due to the heating effect the wire gets heated and this heat is distributed to the base of the electric iron through the process of heat conduction.
The electric water heater is an instrument that uses electric energy and converts it into heat energy to increase the temperature of the water.
An electric water heater heats the cold water by using electric heating elements inside the tank.
An electric bell is an instrument that uses electrical energy and converts it not into the heat energy but sound energy. It first converts the electrical energy to mechanical energy and uses it to produce sound energy.

Among all the options given room heater, electric iron and electric water heater are the instruments used to convert electrical energy into heat energy.
But the electric bell is an instrument which is not used to convert electrical energy into heat energy

Therefore (C) Electric bell is the required answer.

Note: The magnetic field is created by the electromagnet. The magnetic field attracts the iron strip when the circuit is complete. The moment when you hear the sound ringing the hammer present in the bell hits the gong.