A car headlamp of 48 W works on the car battery of 12 V. The correct fuse for the circuit of this car headlamp will be :

(a) 5 A (b) 10 A (c) 3 A (d) 13 A

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Solution

Power = 48 W
Voltage = 12V
Power = V $\times$ I
where I is the current
I = $\frac{P}{V}$
hence
I = $\frac{48}{12}$ = 4A
hence fuse should be just greater than this current, so the answer is 5A

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A car headlamp of 48 W works on the car battery of 12 V. The correct fuse for the circuit of this car headlamp will be : (a) 5 A (b) 10 A (c) 3 A (d) 13 A

Power = 48 W Voltage = 12V Power = V×I where I is the current I =PV hence I =4812 = 4A hence fuse should be just greater than this current, so the answer is 5A

A car headlamp of 48 W works on the car battery of 12 V. The correct fuse for the circuit of this car headlamp will be :

(a) 5 A (b) 10 A (c) 3 A (d) 13 A

Power = 48 W
Voltage = 12V
Power = V $\times$ I
where I is the current
I = $\frac{P}{V}$
hence
I = $\frac{48}{12}$ = 4A
hence fuse should be just greater than this current, so the answer is 5A