Question

9. State Joule's law of heating. When a 12 V battery is connected
acrosa an unknown resistor, there is a current of 2-5 mA in the
circuit. Find the value of the resistance of the resistor. ​

Answer 1

V=12v

I=2.5mA=2.5×10^-3 ×10 = 25× 10^-4

R= ?

R=V/I

R=12/25×10^-4

R=12×10^4/25

R=12 × 10000/25

R =4800

Therefore, R = 4800 ohms

Answer 2

$\huge\underline \mathfrak \pink{Answer...}$

—) 4800 ohms