Two bulbs A and B are rated as 90 W -120V and 60 W -120 V respectively. They are connected in parallel across a 120 V source. Find the current in each bulb. Which bulb will consume more energy?
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power of bulb 1st = p1 = 90 w
power of bulb 2nd = p2 = 60 w
potential difference = v = 120 v
current = ?
1) p1 = v×I
p1/v = I
90/120 = I
0.75 ampere = I
2) p2 = v×I2
p2/v = I2
60/120 = I2
0.6 ampere = I2
current in 90 w bulb is = I = 0.75 ampere
current in 60 w bulb is = I2 = 0.6 ampere
so 90 w bulb consume more energy than 60w bulb
power of bulb 2nd = p2 = 60 w
potential difference = v = 120 v
current = ?
1) p1 = v×I
p1/v = I
90/120 = I
0.75 ampere = I
2) p2 = v×I2
p2/v = I2
60/120 = I2
0.6 ampere = I2
current in 90 w bulb is = I = 0.75 ampere
current in 60 w bulb is = I2 = 0.6 ampere
so 90 w bulb consume more energy than 60w bulb
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