A resistor develops 400 J of thermal energy in 10 s when a current of 2 A is passed through it.
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[ 10 Ω Ω , 3200 J]
Sol. H = I 2 R 
t
⇒ 400 = 2 2 × R × 10
⇒ R = 10 Ω Ω
H = I 2 R 
t
Now I = 4A, 
t = 20s
⇒ H = 4 2 × 10 × 20 = 3200 J
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