Two light bulbs are marked 230v,75w and 230v,150w. If the first bulb has a resistence R,then the resistance of the second is what??
Answers
Answered by
3
Answer:here you go may this help you
Explanation
Power = voltage×current = Voltage×(Voltage/Resistance)
Hence if P is power, V is voltage and R is resistance, then R = V 2 / P
hence for first bulb, R1 = V 2 / 75 = R
for second bulb, R2 = V 2 /150 = (1/2)(V2 / 75) = R/2:
Similar questions