Οwwww8Ω΄Ε EΜ11Ω 1,C11ΩΙΑwwww.www13 Ω12www15ΩAB A battery of unknown e.m.f. isconnected across resistances as shown in Fig. 2.26.The voltage drop across the 8 resistor is 20 V. Whatwill be the current reading in the ammeter? What is thee.m.f. of the battery?

Answered: A battery of unknown e.m.f. is…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Ο
wwww
8Ω
΄Ε E
Μ
11Ω 1,
C
11Ω
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13 Ω
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B

A battery of unknown e.m.f. is
connected across resistances as shown in Fig. 2.26.
The voltage drop across the 8 resistor is 20 V. What
will be the current reading in the ammeter? What is the
e.m.f. of the battery?

Expert Solution

Step 1

We have a circuit as shown in figure .

We have been asked to find the reading of the ammeter means (Current in the branch of 13 Ω resistance) and we have also been asked to find the what is E.M.F of the battery connected in the circuit.

Voltage across 8 Ω resistance is given as 20 V .

First we will find the total current I from the supply as ,

Voltage across 8 Ω resistance is 20 V so,

Current through that resistance will be,

I = $\frac{20}{8}$ (Ohm's Law)

I = 2.5 A

This is current I

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