108 Chapter 6 • Electricity Solution:


(a)


RT = R1 + R2 + R3 = 4 + 6 + 2,75 = 12,75 ohms


(c)


V1 = IT × R1 = 1,88 × 4 = 7,52 V


Example 6.14


An unknown resistor is connected in series with two other series-connected resistors. One has a value of 8 ohms and the other a value of 5 ohms. If the total resistance of the circuit is 19 ohms, what is the value of the unknown resistor?


Solution: RT = R1 + R2 + R3


\ R3 = RT – R1 – R2 = 19 – 8 – 5 = 6 ohms


6.9.2 Resistors in parallel


(b)


In a series circuit: I1 = I2 = I3 = IT = V


= 24


V2 = IT × R2 = 1,88 × 6 = 11,28 V


12 75, = 1,88 A V3 = IT × R3


= 1,88 × 2,75 = 5,17 V


RT


Fig. 6.6 Resistors in parallel


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