Combining Resistors in Series & Parallel Video Lessons

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Problem: Consider the circuit shown in the figure below. (Let R = 18.0 Ω).(a) Find the current in the 18.0-Ω resistor. (b) Find the potential difference between points a and b.

FREE Expert Solution

We are required to combine parallel and series resistors and determine the current through them. 

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 shown in the figure below. (Let R = 18.0 Ω).

(a) Find the current in the 18.0-Ω resistor. 

(b) Find the potential difference between points a and b.

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