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Chapter 2: Q56P-a (page 45)

In the circuit shown in Figure 19.77 the emf of the battery is 7.4V. Resistor R1has a resistance of 31惟, resistor R2 has a resistance of 47惟, and resistor localid="1662203602529" R3has a resistance of localid="1662203617219" 52惟. A steady current flows through the circuit.

(a)What is the equivalent resistance of R1andR2 ? (b) What is the equivalent resistance of all three resistors? (c) What is the conventional current throughR3

Short Answer

Expert verified

18.68惟

Step by step solution

01

Given Data

R1=31惟R2=47惟R3=52惟emf=7.4V

02

Concept

The equivalent resistance is the addition of the resistances, when the batteries are connected in series.

03

Step 3(a): Determine the equivalent resistance of  R1 and R2

The resistors R1 and R2are connected in parallel, then the equivalent resistance,

Req=1R1+1R2=131+147=0.05惟R4=1/0.05=18.68惟

Hence, the equivalent resistance is 18.68惟18.68惟

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