b) A battery of unknown emf is connected across resistances, as shown in fig below. The voltage drop across the 82 resistor is 20V. What will be the current reading in the ammeter? What is the emf of the battery? 11 chm 8 ohm I2 "E 11 ohm As ohm 13 ohm A

b) A battery of unknown emf is connected across resistances, as shown in fig below. The voltage drop across the 82 resistor is 20V. What will be the current reading in the ammeter? What is the emf of the battery? 11 chm 8 ohm I2 "E 11 ohm As ohm 13 ohm A

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter28: Direct-current Circuits

Section: Chapter Questions

Problem 28.21P: Consider the circuit shown in Figure P28.21 on page 860. (a) Find the voltage across the 3.00-0...

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Concept explainers

Temperature Variance of Resistance

Electrical resistance or simply resistance is the property of a material that opposes the free flow of electrons through it. The total amount of resistance to the flow of charges (or current) is affected by many factors like the length of the conducting material, its cross-sectional area, resistivity, and temperature.

Question

b) A battery of unknown emf is connected across resistances, as shown in fig below. The voltage
drop across the 82 resistor is 20V. What will be the current reading in the ammeter? What is the
emf of the battery?
11 chm
8 ohm
I2
-'E
11 ohm
ohm
13 ohm
A

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