A circuit has a fuse of 5A What is the maximum number of 60W (220V) lamps that can be safety used in the circuit?

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

No worries! We‘ve got your back. Try BYJU‘S free classes today!

300

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is B 18
Let all the $n$ bulbs be connected in parallel. Hence the current through the fuse equally divides in all the bulbs, equaling $\frac{5}{n} A$ .
Hence for the safe working
$I_{b u l b} < I_{l i m i t}$
$⟹ \frac{P}{V} < \frac{5}{n}$
$⟹ n < 18.33$
$⟹ n_{m a x} = 18$

Suggest Corrections

Similar questions

Q. A domestic electric circuit has a fuse of

5 A

. What is the maximum number of

100 W (220 V)

bulbs that can be safely used in the circuit?

Q. A circuit has a fuse of

5 A

. What is the maximum number of

100 W (220 V)

bulbs that can be safely used in the circuit?

Q. How many

60 W

bulbs may be safely run on

220 V

using a

5 A

fuse?

A domestic lighting circuit has a fuse of 5 A . If the mains supply is at 230 V, calculate the maximum number of 36 W tube-lights that can be safely used in this circuit.

Q. What is the maximum number of

60 W

bulbs that can be made to run from the mains supply of

220 v o l t s

if we do not want to overload a

5 A

fuse?

Join BYJU'S Learning Program

A circuit has a fuse of 5A What is the maximum number of 60W (220V) lamps that can be safety used in the circuit?

The correct option is B 18Let all the n bulbs be connected in parallel. Hence the current through the fuse equally divides in all the bulbs, equaling 5nA.Hence for the safe working Ibulb<Ilimit⟹PV<5n⟹n<18.33⟹nmax=18

The correct option is B 18
Let all the $n$ bulbs be connected in parallel. Hence the current through the fuse equally divides in all the bulbs, equaling $\frac{5}{n} A$ .
Hence for the safe working
$I_{b u l b} < I_{l i m i t}$
$⟹ \frac{P}{V} < \frac{5}{n}$
$⟹ n < 18.33$
$⟹ n_{m a x} = 18$