   Chapter 18, Problem 48AP

Chapter
Section
Textbook Problem

For the circuit shown in Figure P18.48, the voltmeter reads 6.0 V and the ammeter reads 3.0 m.A. Find (a) the value of R,(b) the emf of the battery and (c) the voltage across the 3.0-kΩ resistor.(d) What assumptions did you have to make to solve this problem? (a)

To determine
The ratio ΔVseriesΔVparallel .

Explanation

Formula to calculate the potential difference in series circuit is,

ΔVseries=IsR

• R is the resistance.
• Is is the current in series circuit.

Formula to calculate the potential difference in parallel circuit is,

ΔVparallel=IpR

• Ip is the current in series circuit

(b)

To determine
The ratio ΔPseriesΔPparallel .

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