Question

an electric lamp and a conductor of resistance 4 ohm are connected in series to 6 volt battery. the current drawn by the lamp is 0.25 A find the resistance of the electric lamp
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Answer 1

Answer:

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Answer 2

let the Resistance of lamp and conductor be,R1 and R2 respectively.

as,

these R1 and R2 are in series

therefore current is constant throughout the circuit.

now,

$R = R1 + R2$

$R=4 + R1 - - (1)$

and we know,

$R= \frac{V}{I}$

$R= \frac{6}{0.25}$

$R = 24ohm - - - (2)$

now by equ. 1 and 2,

$R1=24-4$

$R1=20ohm$

so the resistance of lamp is 20 ohm