First slide

Electrical power

Question

Two similar headlight lamps are connected in parallel to each other. Together, they consume 48 W from a 6 V battery. What is the resistance of each filament?

Easy

A

6 $Ω$
B

4 $Ω$
C

3 $Ω$
D

1.5 $Ω$

Solution

Power consumed by each lamp is 24 W.
Hence, using R = ( $V^{2}$ /P), we find R = (36/24) = 1.5 $Ω$ .

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