Chapter 3: Electricity

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Q
Electricity

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.

Answer:

Given:

Voltage, V = 12 V

Current, I = 2.5 mA

I = 2.5 	imes 10^{-3} A

Resistance, R =  ?

Using Ohm’s law,

V = IR

R = frac{V}{I}

R = frac{12}{2.5 	imes 10^{-3}}

R = 4.8 	imes 10^3 Omega

R = 4.8 kOmega

Therefore, the resistance of the resistor is 4.8 kΩ


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