Question

Several electric bulbs designed to be used on
a 220 V electric supply line are rated at 10 W.
How many lamps can be connected in
parallel with each other across the two wires
of 220 V line, if the maximum allowed
current is 5 A?​

Answer 1

110 Bulbs

Step-by-step explanation:

Given:

Potential Difference,

Voltage (V) = 220 Volts

Power(W) = 10 Watts

Current(I) = 5 Ampere

Let us assume the number of bulbs as n.

Using the formula:

$\fbox{P = VI}$

We obtain,

$10 = 220 * I$

$I = \frac{10}{220}$

$I = \frac{1}{22} A$

$Number Of Bulbs = \frac{Total Current}{Current Through Each Bulb}$

$= \frac{5}{\frac{1}{22} }$

$= 22 * 5 = 110$ Bulbs

Therefore, 110 Bulbs can be connected in parallel.