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Several electric bulb is designed to be used on a 220volt electric supply line are rated 10W how many lamp can be connected in parallelwith each other across the two wires of 220volt line if the maximum allowable current is 5Ampere

Posted by Sankita Sangwan 3 years, 8 months ago

CBSE > Class 10 > Science

2 answers

Somya Mittal 3 years, 8 months ago

V=220 volts Power=10 watts Let current=x ampere P=V×I 10 watt=220volts×x ampere 10÷220=x 1/22 ampere for 1lamp 1/22A- 1 lamp 1ampere-22lamps 1×5ampere-5×22 lamps 5ampere-110 lamps

2Thank You

Ananya Tiwari 3 years, 8 months ago

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.

2Thank You

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CBSE > Class 10 > Science