Combining Resistors in Series & Parallel Video Lessons

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Problem: Consider the circuit with three identical light bulbs shown. What will happen to the brightness of bulbs a and c if bulb b is unscrewed? a. Both bulbs a and c will go out completely b. Both bulbs a and c will remain at the same brightness level that they were before b was unscrewed. c. Bulb a will get brighter and bulb c will get dimmer. d. Bulb a will get dimmer and bulb c will get brighter. e. Bulb a will stay the same but bulb c will get dimmer. f. Bulb a will get brighter and bulb c will stay the same.

FREE Expert Solution

In this problem, we are required to combine resistors in series and in parallel.

Equivalent resistance for resistors in parallel:

1Req=1R1+1R2+...+1Rn

or for 2 resistors:

Req=R1R2R1+R2

Equivalent resistance for resistors in series:

Req=R1+R2+...+Rn

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Problem Details

Consider the circuit with three identical light bulbs shown. What will happen to the brightness of bulbs a and c if bulb b is unscrewed? 

a. Both bulbs a and c will go out completely 

b. Both bulbs a and c will remain at the same brightness level that they were before b was unscrewed. 

c. Bulb a will get brighter and bulb c will get dimmer. 

d. Bulb a will get dimmer and bulb c will get brighter. 

e. Bulb a will stay the same but bulb c will get dimmer. 

f. Bulb a will get brighter and bulb c will stay the same.

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