Question

John performs an experiment on an electric circuit. He increases the voltage from 25 volts to 50 volts while keeping the resistance constant. What will be the effect of John’s changes on the current? A. The current will increase. B. The current will decrease. C. The current will stay constant. D. The current will stop flowing.

Answer 1

the current will be increased because visit increased and resistor is kept constant

Answer 2

ANS: (A)

potential(V) = current(I) × resistance(R)

So, V =IR

R is given constant.

1st condition:

V = 25

LET CURRENT BE I1,

SO, 25 = I1 ×R

I1 = 25/R

2nd condition:

V = 50

LET CURRENT BE I2,

SO, 50 = I2 × R

I2 = 50/R

FOR ANY VALUE OF R, THE CURRENT IN THE 2ND CONDITION WILL BE GREATER THAN THE FIRST CONDITION.

SO CURRENT IS INCREASING, THEREFORE ANSWER IS A.