An electrical appliance has a rating of $4.5 kW - 220 V$ . Which of the following could be the current rating of the fuse (in $A$ ) to be used with the appliance?

25 A

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22 A

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16 A

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12 A

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Solution

The correct options are
A $25 A$
B $22 A$
A fuse wire is made so thin so that when current exceeds the rating of the fuse, it melts hence breaking the circuit.

Power, $P = VI$
For $V = 220 V, P = 4.5 kW = 4500 W$

Given: $I = \frac{P}{V} = \frac{4500}{220} \approx 20.45 A$
So, the current rating of the fuse should be at least $20.5 A$ . Any fuse with rating $> 20.5 A$ can be used to protect the appliance.

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An electrical appliance has a rating of 4.5 kW−220 V. Which of the following could be the current rating of the fuse (in A) to be used with the appliance?

An electrical appliance has a rating of $4.5 kW - 220 V$ . Which of the following could be the current rating of the fuse (in $A$ ) to be used with the appliance?