Question

Several electric bulbs designed to be used on a 220v electric supply line is rated 10w how many lamps can be connected in parallel with each other across the two wires of 220v line if the maximum allowable current is 5a

Answer 1

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 ?

Resistance of each electric bulb, R1=4840?

? Number of electric bulbs connected in parallel are 110

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Answer 2

I=5A

➡️V=220V

➡️P=VI

➡️P=5×220

➡️P=1100W

➡️Power of each bulb=10W

➡️No. of bulb=1100/10=110

➡️➡️Therefore numberof bulb is 110.

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