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CBSE Class 10 Answered

a potential difference of 10 volt is needed to make a current of 0.02 impair for flow through a wire. what potential difference is needed to make a current of 250 mili ampere flows through the same wire
Asked by kritikabrahma23 | 13 Apr, 2021, 07:22: PM
Expert Answer
Initially,
 I= 0.02 A
V = 10 V
By ohm's law, 
V =IR 
10 = 0.02 x R
R = 10/0.02 = 500 Ω
Now, 

If I = 250 mA = 250 x 10-3 A 
R = 500 Ω 
then, V = IR
 V = 250 x 10-3 x 500 
Thus, V = 125 V 
Answered by Shiwani Sawant | 14 Apr, 2021, 12:36: PM
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