Electricity And Magnitism, Resistance

Electricity and Magnetism Level 1

Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220 V?

0.709A 0.727A 0.730A 0.717A

Ankit Vijay by Ankit Vijay , 22, India

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3 solutions

Ronn Concepcion
Jun 19, 2014

P = IV. Thus I=P/V

Total power = P1 + P2 = 100 + 60 = 160 W

Source Voltage = 220 V

Thus,

I=160/220 = 0.727 A

2 Helpful 0 Interesting 0 Brilliant 0 Confused

ncert chapter 12 Q.15 class 10

Toshika Kushwah - 6 years, 11 months ago
Deepak Gowda
Jun 15, 2014

current through first branch I1 = 100/220 = 5/11A

current through second branch I2 = 60/220 = 3/11A

Total current I = I1 + I2 = 8/11 = 0.727A

1 Helpful 0 Interesting 0 Brilliant 0 Confused
Waleed Mustafa
Sep 22, 2014

P = V^2 /R

for first one : 100 = (220)^2/R , R = 484 ohms

for the second one : 60 = (220)^2/R , R = 302.5 ohms

therefore , total current (I) = total Voltage (V) / Total Resistance (R)

I = V/R , then I=V ÷ R1*R2 / R1+R2

so I = 220/302.5 = 0.7272727273

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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