Question

Question 25:
In 10 s, a charge of 25 C leaves a battery, and 200 j of energy are delivered to an outside circuit as a result.
(a) What is the p.d. across the battery ?
(b) What current flows from the battery ?

Lakhmir Singh Physics Class 10

Answer 1

t = 10s

Q = 25 C

(b)

I = Q/t

I = 25/10

I = 2.5 A

(a)

Electrical energy = VIt

200 = V×2.5×10

V = 200/25

V = 8V

Answer 2

Dear Student,

◆ Answer -

V = 8 V

I = 2.5 A

● Explanation -

# Given -

t = 10 s

Q = 25 C

W = 200 J

# Solution -

(a) Potential difference across the battery is -

V = W / Q

V = 200 / 25

V = 8 V

Hence, potential difference across battery is 8 V.

(b) Current flowing from the battery is -

I = Q / t

I = 25 / 10

I = 2.5 A

Thus, current flowing through circuit is 2.5 A.

Thanks dear...