Question

If 100j heat energy is liberated from a resistor of 4 ohm then find voltage across the resistor

Answer 1

Answer:

Explanation:

V² / R = 100 (JOULES LAW OF HEATING)

V² = 100*4 = 400

V = 20 V

Answer 2

The resistor's potential difference given here is 20 V

Given:

Heat produced = 100 J  

Time = 1 second

Resistance across the resistor = 4 ohm

To find:

Potential resistance across the resistor

Solution:

We know that heating effect of electric current,

H=I^{2} R TH=I2RT

The above relation of the heating effect can also be written as,

I^{2}=\frac{H}{R T}I2=RTH

Here, I=5, and R=4 ohm

\Rightarrow \text { According to ohm's law }=V=I R⇒ According to ohm’s law =V=IR

V=5 \times 4=20 \ VV=5×4=20 V

Therefore, the resistor's potential difference is 20 V