Answer the following questions 1. A battery has an emf of 15.0 V. The terminal voltage ofthe battery is 11.6 V when it is delivering 20.0 W ofpower to an external load resistor R. (a) What is thevalue of R? (b) What is the internal resistance of thebattery?2. (a) What is the current in a 5.60-N resistor connected toa battery that has a 0.200-N internal resistance if the ter-minal voltage of the battery is 10.0 V? (b) What is theemf of the battery?3. Two 1.50-V batteries–with their positive terminals inthe same direction-are inserted in series into the bar-rel of a flashlight. One battery has an internal resistanceof 0.255 N, the other an internal resistance of 0.153 N.When the switch is closed, a current of 600 mA occursin the lamp. (a) What is the lamp's resistance? (b) Whatpercentage of the power from the batteries appears inthe batteries themselves, as represented by an increasein temperature?

“Since you have asked multiple question, we will solve the first question for you. If you want any…

1. A battery has an emf of 15.0 V. The terminal voltage of the battery is 11.6 V when it is delivering 20.0 W of power to an external load resistor R. (a) What is the value of R? (b) What is the internal resistance of the battery?

1. A battery has an emf of 15.0 V. The terminal voltage of the battery is 11.6 V when it is delivering 20.0 W of power to an external load resistor R. (a) What is the value of R? (b) What is the internal resistance of the battery?

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter10: Direct-current Circuits

Section: Chapter Questions

Problem 45P: A child's electronic toy is supplied by three 1.58-V alkaline cells having internal resistances of...

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Concept explainers

Ohm's law

Ohm’s law is a prominent concept in physics and electronics. It gives the relation between the current and the voltage. It is used to analyze and construct electrical circuits. Ohm's law states that the voltage across a conductor is directly proportional to the current flowing through it.

Path of Least Resistance

In a series of alternate pathways, the direction of least resistance is the actual or metaphorical route that offers the least resistance to forwarding motion by a given individual or body.

Question

Answer the following questions

1. A battery has an emf of 15.0 V. The terminal voltage of
the battery is 11.6 V when it is delivering 20.0 W of
power to an external load resistor R. (a) What is the
value of R? (b) What is the internal resistance of the
battery?
2. (a) What is the current in a 5.60-N resistor connected to
a battery that has a 0.200-N internal resistance if the ter-
minal voltage of the battery is 10.0 V? (b) What is the
emf of the battery?
3. Two 1.50-V batteries–with their positive terminals in
the same direction-are inserted in series into the bar-
rel of a flashlight. One battery has an internal resistance
of 0.255 N, the other an internal resistance of 0.153 N.
When the switch is closed, a current of 600 mA occurs
in the lamp. (a) What is the lamp's resistance? (b) What
percentage of the power from the batteries appears in
the batteries themselves, as represented by an increase
in temperature?

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