Physics 9702/31 — May/June 2011

Cambridge AS Level · Advanced Practical Skills · worked solutions for every part, with the mark scheme

questions

marks

120

minutes

Topics Manipulation, Measurement and Observation · Presentation of Data and Observations · Analysis, Conclusions and Evaluation

Q1Manipulation, Measurement and ObservationPresentation of Data and ObservationsAnalysis, Conclusions and EvaluationFree sample

You may not need to use all of the materials provided.

In this experiment you will investigate how the characteristics of a circuit vary with its resistance.

(a)

Connect the circuit of Fig. 1.1.

You should expect to spend at least 15 minutes setting up your circuit.

Fig. 1.1

(b)

(i)

Close the switch.

(ii)

Adjust the variable resistor until the current reading is at a maximum.

(iii)

Measure and record the ammeter reading $I$ and the voltmeter reading $V$ .

$I$ = ______
$V$ = ______

(c)

Adjust the variable resistor and repeat (b)(iii) until you have six sets of values of $I$ and $V$ . Include values of $\frac{1}{I}$ and $\frac{1}{V}$ in your table.

Open the switch when you have taken all your readings.

10M

(d)

(i)

Plot a graph of $\frac{1}{I}$ on the $y$ -axis against $\frac{1}{V}$ on the $x$ -axis.

(ii)

Draw the straight line of best fit.

(iii)

Determine the gradient and the $y$ -intercept of this line.

gradient = ______
$y$ -intercept = ______

(e)

It is suggested that the quantities $I$ and $V$ are related by the equation

\frac{1}{I} = \frac{3R}{V} + k

where $R$ and $k$ are constants.

Use your answer in (d)(iii) to determine the value of $R$ . Give appropriate units.

$R$ = ______

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