Question

100 J of heat are produced each second in a 2.5Ω resistance. Find potential difference across the resistor?

Answer 1

Given :-
i) Heat energy (H) = 100 J
ii) Time (t) = 1 second
iii) Resistance (R) = 2.5 Ω

To find:-
i) Potential difference (V) = ?

Formula to be used :-
i) H= I²Rt

Solution :-
∵ H = I²Rt.........(1)

And by Ohm's Law,

V = I * R
∴ I = V/R..........(2)

Substituting eqn 2 in eqn 1, we get

∴ H = (V/R)² * R * t
H = V² * t / R
∴ V² = H*R / T

∴ V² = 100 * 2.5 / 1
∴ V² = 250
∴ V = √250
∴ V = 5√10 Volts.

Hope this helps you !!

Answer 2

Answer:

P=v²/r =v²=P x R =1000w x 2.5 resistance.

Explanation:

v² =2500

v=under root 2500

v=50.