Two lamps, one rated 40W - 240 V and the other 60W- 240V are connected in parallel to 240 V supply. What current is drawn from the supply line?

0.816 A

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0.416 A

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0.616 A

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0.216 A

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Solution

The correct option is B
0.416 A

Here, R₁ = V² /P_{1 = (240x240) / 40 = 1440 ohm}

and R2 = V² /P₂ = (240×240)/ 60 = 960 ohm

Again, R = R₁R₂/(R₁+ R₂ ) = 567 ohm

And I = V/R = 240 / 567 = 0.416 A

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Two lamps, one rated 40W - 240 V and the other 60W- 240V are connected in parallel to 240 V supply. What current is drawn from the supply line?

The correct option is B 0.416 A Here, R1 = V2 /P1 = (240x240) / 40 = 1440 ohm and R2 = V2 /P2 = (240×240)/ 60 = 960 ohm Again, R = R1R2/(R1 + R2 ) = 567 ohm And I = V/R = 240 / 567 = 0.416 A

The correct option is B
0.416 A

Here, R₁ = V² /P_{1 = (240x240) / 40 = 1440 ohm}

and R2 = V² /P₂ = (240×240)/ 60 = 960 ohm

Again, R = R₁R₂/(R₁+ R₂ ) = 567 ohm

And I = V/R = 240 / 567 = 0.416 A