Determine the current passing through each of the bulbs. or the circuit shown below, each of the resistors represents a light bulb.

Question

An old fashioned string of 80 Christmas lights is wired in series. Each bulb has a resistance of 2.0 Ohms and the entire string is plugged into a 120 V outlet. 

Answer 1

With 80 bulbs in series, each having R = 2.0 Ohms, the total resistance in the circuit is 160 Ohms. Hence V = 120 = I•R = 160•I yields current I = 0.75 Amps.