The resistance of the light bulb is 266.7Ω
What is resistance?
When an electric current flows through a bulb or any conductor, the conductor offers some obstruction to the current and this obstruction is known as electrical resistance and is denoted by R. Every material has an electrical resistance and this is the reason why conductors give out heat when current passes through it. The unit of electrical resistance is ohms.
According to Ohm’s law, there is a relation between the current flowing through a conductor and the potential difference across it. It is given by,
V ∝ I V = IR
Where,
V is the potential difference measured across the conductor (in volts)
I is the current through the conductor (in amperes)
R is the constant of proportionality called resistance (in ohms)
Therefore, R = V/I
To find the Resistance;
R = V/I
where V = 120V
I = 0.45A
R = 120/0.45
R = 266.7Ω
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