Question

In: Physics

Which of the following statements are true? The internal resistance of a battery decreases with decreasing temperature. A...

Which of the following statements are true? 

The internal resistance of a battery decreases with decreasing temperature. 

A battery is a device that produces electricity by transforming chemical energy into electrical energy. 

The potential difference between the terminals of a battery, when no current flows to an external circuit, is referred to as the terminal voltage. 

A battery does work on electric charges to bring them to a position of higher electric potential energy so that they can flow through a circuit to a lower potential energy.

Solutions

Expert Solution

Concepts and reason

The concept required to solve this problem is that a battery is composed of chemicals which after reaction produces electricity.

In this problem first identify the wrong statements based on the concept and finally identify the correct statement which gives the correct explanation.

Fundamentals

Internal resistance: The resistance offered by the battery is called the internal resistance of the body.

EMF of a battery: The potential difference between the terminals of a battery, when no current is flowing into an external circuit is called emf of the battery.

Terminal voltage: The potential difference between the terminals of a battery, when the current is flowing into an external circuit is called emf of the battery.

As the temperature is increased the rate of the reaction also increases. More the rate of the reaction more will be the current hence smaller resistance. So, the internal resistance of the battery increases as decreasing the temperature.

Hence, the first statement is false.

The potential difference between the terminals of a battery, when the current is flowing into the external circuit is called terminal voltage,

Hence, the third statement is false.

A battery is a device which produces potential difference by using the chemical reactions inside it.

Hence, the second statement is true.

The higher potential terminal of the battery is denoted with + sign and lower potential terminal is denoted by negative sign. The current flows from positive terminal to negative terminal. Hence it can be concluded that the battery works to move the charge from the higher potential to lower potential.

Hence, the fourth statement is true.

Ans:

The second and fourth statements are true.

genius_generous answered 2 years ago
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