Question

A 20 Ω light bulb and a 10 Ω light bulb are placed in series with one another in a circuit (along with a battery). Which one of the following statements is true regarding these light bulbs? a. The 20 Ω light bulb will have the same voltage drop as the 10 Ω light bulb.

b. The 20 Ω light bulb will have the same amount of current as the 10 Ω light bulb.

c. The 20 Ω light bulb will have the same amount of brightness (i.e. power dissipation) as the 10 Ω light bulb.

d. The 10 Ω light bulb will be brighter than the 20 Ω light bulb.

e. The three statements above a), b), and c) are correct.

Answer 1

When in series, the current flowing through all components are the same. Now since both the light bulbs are in series, so the current flowing through both 20 and 10 light bulbs will be equal.

So Option b is correct.