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Chapter 27: Q. 12 (page 761)

Which, if any, of these statements are true? (More than one may be true.) Explain. Assume the batteries are ideal.

a. A battery supplies the energy to a circuit.

b. A battery is a source of potential difference; the potential difference between the terminals of the battery is always the same.

c. A battery is a source of current; the current leaving the battery is always the same.

Short Answer

Expert verified

a. True. Circuits convert the stored energy of batteries (usually chemical) into electric energy.

b. True. The potential difference between two batteries can never change over time.

c. False. A battery's output current depends on the circuit connected to it.

Step by step solution

01

Concept Introduction (Part a)

The electrochemical reaction (redox) of oxidation-reduction is used in batteries to convert chemical energy into electrical energy. Electric circuits allow electrons to be transferred from one material to another during this type of reaction.

02

Explanation (Part a)

Potential difference is produced by the battery. Due to this potential difference charges have enough energy to flow through the circuit. Thus, battery supplies energy to a circuit.

03

Final Answer (Part a)

Hence, option (a) A battery supplies the energy to a circuit is a true statement.

04

Concept Introduction (Part b)

The electrochemical reaction (redox) of oxidation-reduction is used in batteries to convert chemical energy into electrical energy. Electric circuits allow electrons to be transferred from one material to another during this type of reaction.

05

Explanation (Part b)

A potential difference is produced by the battery. Considering the battery as an ideal battery. When a battery is ideal, there is always a constant difference in potential between its terminals.

06

Final Answer (Part b)

Hence, option (b) A battery is a source of potential difference; the potential difference between the terminals of the battery is always the same is a true statement.

07

Concept Introduction (Part c) 

The electrochemical reaction (redox) of oxidation-reduction is used in batteries to convert chemical energy into electrical energy. Electric circuits allow electrons to be transferred from one material to another during this type of reaction.

08

Explanation (Part c)

Batteries do not always discharge the same amount of current. The current leaving the battery depends on the resistance in the circuit.

09

Final Answer (Part b)

Hence, option (c) A battery is a source of current; the current leaving the battery is always the same is a false statement.

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