A string of 15 identical Christmas tree lights are connected in series to a 127 V source. The string dissipates 58 W.What is the equivalent resistance of the light string?

Question

Answer in units of Ω

Answer 1

P = E^2/R = 58 Watts.
(127)^2/R = 58
58R = (127)^2
R = (127)^2/58 = 278 Ohms.