Question

When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.

• A. $4800\Omega$
• B. $2400\Omega$
• C. $3600\Omega$
• D. $1200\Omega$

Answer 1

The correct option is A $4800\Omega$

Given:
Current, $I=2.5mA$ = $2.5\times {10}^{-3}A$
Voltage, $V=12V$
According to Ohm's law,
Resistance, $\text{R}=\frac{V}{I}$

= $\frac{12V}{2.5\times {10}^{-3}A}$

= $4800\Omega$