Chapter 12 Magnetic Effects of Electric Current Questions-05
Questions
1. Name two safety measures commonly used in electric circuits and appliances.
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Answer
Two safety measures commonly used in electric circuits and appliances are as follows:
(i) Each circuit must be connected with an electric fuse. This prevents the flow of excessive current through the circuit. When the current passing through the wire exceeds the maximum limit of the fuse element, the fuse melts to stop the flow of current through that circuit, hence protecting the appliances connected to the circuit.
(ii) Earthing is a must to prevent electric shocks. Any leakage of current in an electric appliance is transferred to the ground and people using the appliance do not get the shock.
2. An electric oven of
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Answer
Current drawn by the electric oven can be obtained by the expression,
Where,
Current
Power of the oven,
Voltage supplied,
Hence, the current drawn by the electric oven is
3. What precaution should be taken to avoid the overloading of domestic electric circuits?
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Answer
The precautions that should be taken to avoid the overloading of domestic circuits are as follows:
(a) Too many appliances should not be connected to a single socket.
(b) Too many appliances should not be used at the same time.
(c) Faulty appliances should not be connected in the circuit.
(d) Fuse should be connected in the circuit.
