Two fuse wires have ratings of 10 A - 13 A-A- 10 A fuse wire will be thicker- assuming same lengthB- 13A fuse wire will be thicker- assuming same lengthC- Both will have same thickness and lengthD- Both will have same thickness but 10 A fuse will be longerE- Both will have same thickness but 13 A fuse will be longer

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Fuses

Two fuse wire...

Question

Two fuse wires have ratings of 10A & 13A.

10A fuse wire will be thicker, assuming same length

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13A fuse wire will be thicker, assuming same length

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Both will have same thickness and length

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Both will have same thickness but 13A fuse will be longer

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Both will have same thickness but 10A fuse will be longer

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Solution

The correct option is B
13A fuse wire will be thicker, assuming same length

Thicker wires have a smaller resistance as R_wire is inversely proportional to the Area of cross –section of the wire. Thus, 13A fuse wire is thicker than 10A fuse wire because its resistance should be smaller than that of 10A fuse wire.

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Question 18

Paheli took a wire of length 10 cm. Boojho took a wire of 5 cm of the same material and thickness. Both of them connected the wires as shown in the circuit given in Figure. The current flowing in both the circuits is the same.
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