Out of the following bulbs rated 40W, 220V ,60W, 220V and 100W, 220V which one will glow the brightest when connected in series to a supply of 220V ?

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Solution

P = E²/R
100 = 220²/R1
R1 = 484 ohms (100)
R2 = 807 ohms (60)
R3 = 1210 ohms (40)

All 3 in series, R = 2501 ohms
I = 220/R = 0.0880 amps
P = 19 watts

P1 (100) = 0.0880²484 = 3.75 watts
P2 (60) = 0.0880²807 = 6.25 watts
P3 (40) = 0.0880²*1210 = 9.37 watts
So 40w bulb will glow brightest

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Out of the following bulbs rated 40W, 220V ,60W, 220V and 100W, 220V which one will glow the brightest when connected in series to a supply of 220V ?

P = E²/R 100 = 220²/R1 R1 = 484 ohms (100) R2 = 807 ohms (60) R3 = 1210 ohms (40) All 3 in series, R = 2501 ohms I = 220/R = 0.0880 amps P = 19 watts P1 (100) = 0.0880²*484 = 3.75 watts P2 (60) = 0.0880²*807 = 6.25 watts P3 (40) = 0.0880²*1210 = 9.37 watts So 40w bulb will glow brightest

P = E²/R
100 = 220²/R1
R1 = 484 ohms (100)
R2 = 807 ohms (60)
R3 = 1210 ohms (40)

All 3 in series, R = 2501 ohms
I = 220/R = 0.0880 amps
P = 19 watts

P1 (100) = 0.0880²484 = 3.75 watts
P2 (60) = 0.0880²807 = 6.25 watts
P3 (40) = 0.0880²*1210 = 9.37 watts
So 40w bulb will glow brightest