Question

the resistance of a resistor is kept constant and the potential difference across it's two ends is increased to two times of its former value. state the change that will occur in the current through it? ​

Answer 1

Answer:

hello,

let the current be i

let the resistance be r

let the p.d. be v

by ohm's law

v=ir

i=v/r................................1

now resistance is kept at constant 

v is now v/2 and let the current be I

therefore,

v/2=Ir

I=v/2r

but from 1 we see that v/r is initial current 

therefore,I=i/2

hence the current also decreased by half of its former value

                             OR

we know that current is directly proportional to p.d.

hence if current decreases p.d. will also decrease with the same amount

therefore p.d. is decreased by 1/2 current will also be decreased by 1/2

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Explanation: