Question

Question 33:
A p.d. of 10 V is needed to make a current of 0.02 A flow through a wire. What p.d. is needed to make a current of 250 mA flow through the same wire ?

Lakhmir Singh Physics Class 10

Answer 1

Answer:

125V

Explanation:

Since by the help of Ohm's law we can conclude that V=IR

so 10V and 0.02 A gives 500 ohm resistance

250 mA and 500ohm will give 125 V

V=250/1000*500=1/4*500=125V

Answer 2

Dear Student,

◆ Answer -

Required voltage = 125 V

● Explanation -

# Given -

I1 = 0.02 A

V1 = 10 V

I2 = 250 mA = 0.25 A

# Solution -

Resistance of the wire is calculated as -

R = V1/I1

R = 10/0.02

R = 500 ohm

Voltage required to pass 250 mA current is -

V2 = I2.R

V2 = 0.25×500

V2 = 125 V

Therefore, potential difference of 125 V is required.

Thanks dear...