A light bulb used in a slide projector draws a current of 6 amperes when operating on 120 volts. If two slide projectors are connected in series across the same 120-volt source, the current drawn from the source in amperes is

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Quizplus · Accepted Answer

When two resistive loads (like the slide projectors) are connected in series, the total resistance increases, and the current through the circuit decreases. Since each projector draws 6 amperes at 120 volts, their resistance can be calculated using Ohm's law (V = IR), which gives R = V/I = 120V/6A = 20 ohms for each projector. When connected in series, the total resistance is the sum of their resistances, which is 40 ohms. Using Ohm's law again for the total circuit gives I = V/R = 120V/40 ohms = 3 amperes.

A Light Bulb Used in a Slide Projector Draws a Current