Asked by Allen
A 75-W, 120-V bulb is connected in parallel with 25-W, 120-V bulb. What is the net resistance?
Answers
Answered by
MathMate
Power = V²/r watts
so resistance for the 75W bulb
R1 = 120²/75 Ω = 192 Ω
Similarly calculate R2 for the 25W bulb.
Net resistance of two resistors in parallel
R = 1/(1/R1+1/R2)
so resistance for the 75W bulb
R1 = 120²/75 Ω = 192 Ω
Similarly calculate R2 for the 25W bulb.
Net resistance of two resistors in parallel
R = 1/(1/R1+1/R2)