An electric kettle is rated 3KW,250V. Give reason whether this kettle can be used in a circuit which contains a fuse of current rating 13A

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Solution

A fuse of current rating 13 𝐴 will allow the
maximum current of 8 𝐴 to pass through it
without damaging it.
Given, the rating of the electrical appliance
Power, 𝑃 = 3 𝑘𝑊 𝑎𝑛𝑑
Voltage 𝑉 = 250 𝑉𝑜𝑙𝑡𝑠
Maximum current that can flow through the
appliance,
𝐼𝑐𝑟. =Power/𝑉𝑜𝑙𝑡𝑎𝑔𝑒
𝐼𝑐𝑟. =3000 𝑊/250 𝑉
𝐼𝑐𝑟. = 12 𝐴
𝐼𝑐𝑟 . (12 𝐴) is lesser than Imax. (13 𝐴).
Hence, the 13 A current rating fuse can be
used with the given electric kettle

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