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ICSE Class 10 Physics Question 13 of 20

Solved 2018 Question Paper ICSE Class 10 Physics — Question 10

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10
Question

Question 8(a)

(i) A fuse is rated 8A. Can it be used with an electrical appliance rated 5 KW, 200 V? Give a reason. [3]

(ii) Name two safety devices which are connected to the live wire of a household electric circuit.

Answer

Given,

P = 5 KW = 5000 W,

V = 200 V

Current drawn i = PV\dfrac{P}{V} = 5000W200V\dfrac{5000 W}{200 V} = 25 A

Since, the appliance when in use will draw 25 A current, the fuse rated 8 A cannot be used because it will blow off as the current will exceed 8 A and the circuit wil break.

(ii) Safety devices which are connected to the live wire of a household electric circuit are switch and fuse.