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Question

A resistance coil is made by combining two 2.5 ohm resistances in series. A 1.0 V steady voltage is applied across the two ends of the coil for 5 minutes. The heat generated is:


Solution

Req = R1 + R2 = 2.5 + 2.5 = 5 

V = 1V

V = IR
I = V/R
  = 1/5
  = 0.2A


H = (I^2) * R * t
    = (0.2)^2 * 5 * 300    (TIME IN SECONDS)
    = 60J

 

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