A length of uniform ‘heating wire’ made ...

A length of uniform ‘heating wire’ made of nichrome has a resistance 72 ` Omega`. At what rate is the energy dissipated if a potential difference of 120V is applied across (a) full length of wire (b) half the length of wire (wire is cut into two). Why is it not advisable to use the half length of wire ?

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(a) 200 W, (b) 400 W, 400 W ` gt gt ` 200 W but since current becomes large so it is not advisable to use half the length

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