Question

calculate the amount of heat generated when 7200 coulombs is transferred in 1 hour through p.d of 5 volt

Answer 1

Thanks for your question !

Let we see given,
Q = 7200
t = 1 hour i.e. 60 × 60 = 3600 s.
V = 5 V
We know that,
I = Q / t
  = 7200 / 3600
  = 2 A.
Now,
R = V / I
   = 5 V / 2 A
   = 2.5 Ω
H = I²Rt
    = 2 × 2 × 2.5 × 3600
    = 4 × 2.5 × 3600
    = 10 × 3600
    = 36000 J
    = 36 KJ

     The amount of heat generated when 7200 coulombs is transferred in 1 hour through potential difference of 5 volts is 36 kilo joules.