You are provided with a power supply (a 6 V battery charger), four identical lig

Question

You are provided with a power supply (a 6 V battery charger), four identical light bulbs, and a resistor. Connect two of the light bulbs in series with the power supply as shown in Diagram 1 (call this circuit 1). Now, connect the two remaining light bulbs to the circuit in such a way that all four light bulbs glow with the same brightness as they did in Diagram 1 (call this circuit 2). Draw a diagram of your new circuit. Replace one of the bulbs by the resistor and notice that the remaining three bulbs still glow with the same brightness (call this circuit 3). Use the ohmmeter provided to measure the value of the resistor and the resistance of one of the bulbs (take the resistor and the bulb out of the circuit to do this).

A. Explain why the resistor and the light bulb can have two different resistances yet behave the same way in the circuit.

B. Was the current through each of the light bulbs the same in all three circuits?

C. What was the potential difference across each of the light bulbs in all three circuits (take the potential difference of the battery charger to be 6 Volts)?

Explanation / Answer

A.SINCE THEY HAVE THE SAME PD.

B.IN CIRCUIT 1 ITS SAME. BUT IN CIRCUIT 2 AND 3 THE CURRENT IS DIFFERENT AS THEY HAVE TO BE CONNECTED IN PARALLEL FOR SAME INTENSITY.

C.IN THE CIRCUIT1 THE BULBS ARE IN SERIES SO EACH BULB WILL HAVE 3V EACH. IN CIRCUIT 2 AND 3 THE P.D WILL BE 6V EACH AS THEY ARE CONNECTED IN PARALLEL.

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