Question

Number of Electric lamp designed to be used on a 220v Electric Supply are rated 10 Watt each. Calculate the number of length that can be connected in parallel to each other across the two wires of 220 V line is 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.

Answer 2

$\huge{\mathfrak{\underline{Solution:}}}$

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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.

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