Question

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.

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Answer 1

Answer:

60 Volt

Explanation:

here, H = 400 J

R = 9 ohm

t = 1 s

v = potential difference

we know,

from joule's law

h = \frac{ {v}^{2} t}{r}

=> 400 = \frac{ {v}^{2} \times 1}{9}

=> {v}^{2} = 400 \times 9

=> v = \sqrt{400 \times 9}

=> v = 20 \times 3

=> v = 60

so, the potential difference is 60 V

Answer 2

Answer:

Explanation:

Given: R = 9 Ω

H = 400 J

t = 1 s

To find: V = ?

Formula: H = V2

t

R

Solution: H = V2

t

R

400 = V2 × 1

9

3600 = V2

V = √ 3600

V = 60 V