A cell is connected to a 9 ohm resistance, because of which heat of 400 J is produced per second due to current flowing through it. Obtain the potential difference applied across the resistance.


 Here, heat is given as 400 J per second.

So, P= 400 J / 1 s

Suppose the equation used is P= V2/R, replacing the values you get

400 = V2/9.

Hence, V2= 400 x 9

Therefore, V will be √(400 x 9) = 20 x 3=60V

Thus, potential difference applied across the resistance is 60V.

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