A 75 watt bulb and a 15 watt bulb are wired in series across 120 volts. What hap

Question

A 75 watt bulb and a 15 watt bulb are wired in series across 120 volts. What happens? 1 a) Both bulbs are dimmer than before, but the same brightness as each other 1 b) Both bulbs have the same brightness, but the 15 W is brighter than before 7 c) Both bulbs are dimmer than before, but in the same pattern 75 W is brighter 5 d) 15 W glows just as it did before, but the 75 W is dimmer than before 2 e) 15 W is dimmer than before and the 75 W is brighter than before o f) both bulbs are dim, but the same brightness as each other 1 g) 75 W does not glow at all, 15 W glows normally 1 h) 15 W does not glow at all, 75 W glows normally o i) nothing happens at all (don't pick this one!)

Explanation / Answer

When the bulbs are in series, the current flowing through them is constant.But in series ,the equivalent resistance increases and thus, the current flowing through both of them decreases as I = V/Requ.Thus, the power consumed by the bulbs is given by, P1=I2*R1 andP2=I2*R2 .

Thus, the bulbs are dimmer than before but glow in the same pattern as before, that is 75W is brighter.

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