Two bulbs A and B are rated 100 W, 120 V and 10 W, 120 V respectively. They are connected across a 120 V source in series. Calculate the current through each bulb. Which bulb will consume more power?

Answer 1

Calculate R1 and R2 from

R1= V²_{/ P =(120×120) /100 =144 Ω}

_{R2 = (120×120) / 10 = 1440 Ω}

_{apply ohms law}

_{I = V/ R total}

_{I = 120 / (1440 +14) = # A}

_{to find out the bulb which consumes more power use}

_{p = I}²_{× R}