Question

Electric heater converts
A. electrical energy into chemical energy
B. chemical energy into electrical energy
C. heat energy into electrical energy
D. electric energy into heat energy

Answer 1

Hint: As the name itself says that it is a heater, we can say that the output will always be the heat energy and it also has the word electric in the name, we can guess that since heat is coming in the output side, then electric energy will be the input.

Complete step-by-step answer:
Electric heater is a device that has a heating element inside it called the electrical resistor and we know that whenever electric current passes through a resistor, heat is generated which can be known on the basis of the principle of Joule heating. The heat is generated because of the collision of conduction electrons with the conductor’s atoms on a microscale.
Thus, we can say that an electric heater is a device that converts electrical energy into heat energy.

Additional information:
Joule heating which is also known as the resistive or ohmic heating describes the process of conversion of electric current into heat as it passes through a resistance. It states that whenever electric current flows through a solid or liquid medium having some finite conductivity, generation of heat occurs from the electric current due to the resistive losses of the material.
Joule heating effect is often undesirable in the design of any machine which causes loss of fuel or electricity. In order to reduce this heating many devices are incorporated with convection cooling designs.

Note: Many questions like these can be solved by having a good look at the name of the device given. We can break the name given and find its meaning. Many times, the name is coined using different syllables with different meanings.