1. What can you say about the electric current that flows through two or more bu

Question

1. What can you say about the electric current that flows through two or more bulbs connected one after another in a series?

2. What can you say about the voltage drops across light bulbs in parallel?

3. If you were to follow a single (positive) electric charges as it flows around any complete path in the circuit, starting from the positive battery terminal returning to the negative battery terminal and added up each voltage drop the charge experienced, how would the total voltage drop from the light bulbs compare to the voltage supplied by the battery?

Explanation / Answer

1)

In series, same current flows through both bulbs

So, current is same

2)

In parallel, same voltage drop will be across both bulbs

So, voltage is same

3)

Using Kirchoff’s voltage law, net voltage in circular path = 0

So, V + E = 0

V = -E

So,

voltage drop across bulb = -voltage supplied by battery

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