4.2 Electrical quantities

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Question 89

An investigation is carried out to determine how the terminal potential difference $V$ of a battery changes with the current $I$ in a circuit.

State how a voltmeter must be connected to measure the potential difference between two terminals $X$ and $Y$ .

[1]

The following table shows the recorded measurements of current $I$ and potential difference $V$ :

Current $I$ / $A\text{A}$	Potential Difference $V$ / $V\text{V}$
0.20	2.70
0.40	2.38
0.60	2.12
0.80	1.80
1.00	1.48
1.20	1.22

Plotting a graph of $V$ ( $y$ -axis) against $I$ ( $x$ -axis) yields a straight line with a negative gradient. Explain how to determine the gradient $M$ of this line of best fit using the triangle method.

[2]

Use the data points to calculate the gradient $M$ of the line of best fit.

[2]

The internal resistance $r$ of the battery is equal to the magnitude of the gradient $M$ . State the value of $r$ to a suitable number of significant figures, including the unit.

[2]

Current

I

A\text{A}

Potential Difference

V

V\text{V}

0.20

2.70

0.40

2.38

0.60

2.12

0.80

1.80

1.00

1.48

1.20

1.22

4.2 Electrical quantities

Question 89

Markscheme

4.2 Electrical quantities

Question 89

Markscheme

4.2 Electrical quantities

Question 89

4.2 Electrical quantities Questions

4.2 Electrical quantities

Question 89

4.2 Electrical quantities Questions