Three bulbs, each with a resistance of 180 , are connected in parallel to an ideal battery of emf 60 V . Determine the current delivered by the battery when two of the bulbs are switched on.

Step-by-step solution

When two bulbs are switched on, they are connected in parallel across the battery. The equivalent resistance of the circuit is given by R_ eq = R 2 = 180 2 = 90 The current delivered by the battery is I = V R_ eq = 60 90 = 2 3 A I 0.67 A