Question

If the resistance of a circuit is halved and the potential difference is kept constant, then the current will become

• A. 4 times
• B. 8 times
• C. double
• D. half

Answer 1

The correct option is C double

Answer is C.
According to Ohm's law, V = IR. That is, I = V/R.
Now, if the resistance is halved and the voltage remains the same, the new value of current becomes, $I^{\prime }=\frac{V}{\frac{R}{2}}=\frac{2V}{R}.Thatis,I^{\prime }=2\left(\frac{V}{R}\right)=2I$.
Hence, the current will become double.