Ex 3: All the batteries and the light bulbs (A-E) in figure below are identical in circuits 1-3. 9V 9V Circuit 1 B 9V Circuit 2 a) The current passing through the bulb A is 10 mA. What is the current passing through B, C, D and E? lp=lc=lp=e= Circult 3 b) All the batteries started with same amount of usable energy and connected at the same time. The battery in which circuit will last the longest? (Circle one) Circuit 1 / Circuit 2 / Circuit 3 c) A switch S is connected as shown in Circuit 4? What happens to the brightness of bulb X when the switch S (originally closed) is opened? X becomes brighter IX becomes dimmer I No change happens to X. 9 V Circuit 4

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