Physics
Grade-7
Easy
Question
Which of the following does NOT contain a heating element?
- Electric oven
- Electric bell
- Electric heater
- Electric iron
Hint:
Electric bell
The correct answer is: Electric bell
An electric bell contains an electromagnet, consisting of coils of insulated wire wound around iron rods. When an electric current flows through the coils, the rods become magnetic and attract a piece of iron attached to a clapper. The clappers hit the iron and make it ring.
Thus, electric bell works on the magnetic effect of electric current.
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Statement 2: Various electrical appliances that are based on the heating effect of current contain a coil of wire called an element.
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