7th Class Science Sample Paper Science Sample Paper - 4

  • question_answer
    How do the electric heater and an electric iron work?

    Answer:

    Electric heater and iron work on the basis of heating effect of electricity. When an electric current passes through the wires they become hot. Electric heater or iron contains a coil of wire. This coil of wire is called an element. When these appliances are switched on after connecting to the electric supply, their elements become red hot and give out heat.


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