Question

when a 12v battery is connected across an unknown resistor there is a current of 2.5mA in the circuit.find the value of the resistance of the resistor​

Answer 1

Using v=ir
2.5mA=0.0025A
So,
12=0.0025r
r=4800 ohm

Answer 2

Answer:

R=V/I

R=12/2.5

=4.8 ohm