Question

When a 12v battery is connected across an unknown resistor?

Answer 1

We have potential difference (V) = 12V

Electric current (I)=2.5 mA= 2.4×10-3

According to Ohm’s Law (V) = IR

Or R = V/I

$r = \frac{12}{2.5 \times 10 ^{ - 3} } = 4.8 \times {10}^{ - 3}$