Answer :

(a), Here it is given,

I = 4 amp,

t = 10 min = 10 x 60 = 600sec, H = 2.88x104J

We Know that according to Joule's law of heating

H = I2RT

28800 = 42xRx600

R = 3ohms

We know that

P = I2xR

= 42x3

P = 48W

(b) Here we have to find the potential difference, V = ?

We know that

V = IR

V = 4x3

V = 12V

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