The figure shows a circuit with two identical light bulbs in series. a) What do

Question

The figure shows a circuit with two identical light bulbs in series.

a) What do you expect to find for the currents at points 1, 2 and 3 in this circuit? Will they be equal? If so, will the value be the same as for the single bulb? If not, which current will be the largest? Explain your answer.

b) What do you expect to find for the voltage across each light bulb? Will the values be equal? Will they be equal to the voltage provided by the battery, as you found for the single light bulb? Explain your answer.

Explanation / Answer

1. As the bulbs are connected in series, the current passing through each of the bulb will be same although the brightness will be much less due to increased resistance and halved current but current will be same throughout.

2. Considering the resistance is same for each bulb, the voltage drop will be there across each bulb however this driop will same for both the bulbs and it may be given by V/2 where V is the battery capacity.

NOTE - In this circuit, we can analyze the direction of current by looking at the battery terminals as current always flows from positive to negative, it should be clockwise.

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