Question

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

Answer 1

v=ir12v =2.5*rr      = 12/2.5
r      =4.8

Answer 2

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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=12v/2.4×10^-3

=12v×10^3/2.4

=120×10^3/24

=4.8×10^3