Question

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

Answer 1

Answer:

Number of electric bulbs connected in parallel are 110.

Explanation:

Resistance R1 of the bulb is given by the expression,

Supply voltage, V = 220 V

Maximum allowable current, I = 5 A

Rating of an electric bulb P=10watts

Because R=V2/P

According to Ohm’s law,

V = I R

Let R is the total resistance of the circuit for x number of electric bulbs

R=V/I

=220/5=44 Ω

Resistance of each electric bulb, R1=4840Ω

∴ Number of electric bulbs connected in parallel are 110.