5-3 Electric Cells

Science

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5 questions

Isabelle

•over 3 years ago

Question 1

Multiple Choice

10 points

A cell has an emf of 4.0 V and an internal resistance of 2.0 Ω. The cell is connected in series to a load resistor R. An ideal voltmeter connected across the load resistor reads 3.2 V. What is the resistance of R?

0.8 Ω

2.0 Ω

4.0 Ω

8.0 Ω

Question 2

Multiple Choice

10 points

A 12V battery has an internal resistance of 2.0 Ω. A load of variable resistance is connected across the battery and adjusted to have resistance equal to that of the internal resistance of the battery. What is the current in the battery?

2 A

3 A

4 A

6 A

Question 3

True/False

10 points

A 12V battery has an internal resistance of 2.0Ω. A load of variable resistance is connected across the battery and adjusted to have resistance equal to that of the internal resistance of the battery. True or False? "The potential difference across the load is 12V."

A.True

B.False

Question 4

Multiple Choice

10 points

A 12V battery has an internal resistance of 2.0Ω. A load of variable resistance is connected across the battery and adjusted to have resistance equal to that of the internal resistance of the battery. What is the power dissipated in the battery?

12 W

18 W

30 W

36 W

Question 5

Numerical Answer

10 points

A student made a circuit connecting a cell and a variable resistor in series. They obtain the following graph showing the variation with current I of the potential difference V across the cell:

https://drive.google.com/file/d/1cbNQ6N9b7cF4bAqKCUrYGKYZ42iM8xxK/view?usp=sharing. Using the graph, determine the best estimate of the internal resistance of the cell.