We are required to combine parallel and series resistors and determine the current through them.
Equivalent resistance for resistors in parallel:
or for 2 resistors:
Equivalent resistance for resistors in series:
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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