Question 18.3: EQUIVALENT RESISTANCE GOAL Solve a problem involving both se...
EQUIVALENT RESISTANCE
GOAL Solve a problem involving both series and parallel resistors.
PROBLEM Four resistors are connected as shown in Figure 18.12a. (a) Find the equivalent resistance between points a and c. (b) What is the current in each resistor if a 42-\mathrm{V} battery is connected between a and c ?
STRATEGY Reduce the circuit in steps, as shown in Figures 18.12b and 18.12c, using the sum rule for resistors in series and the reciprocal-sum rule for resistors in parallel. Finding the currents is a matter of applying Ohm’s law while working backwards through the diagrams.
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