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Question
A fuse is rated 8A. Can it be used with an electrical appliance rated 5 KW, 200 V ? Give a reason.
Solution
`P = 5 xx 10^3 W`
V = 200
`:. P = IV`
`5 xx 10^3 = I[200]`
`5000/200 = I`
I = 25 A
25 A > 8 A
Yes it can be used ∵ current is greater than 8A
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