Physics 9702/34 — May/June 2012

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 the change in current in a circuit as its resistance is changed.

(a)

(i)

Assemble the circuit of Fig. 1.1.

Fig. 1.1

(ii)

Close the switch.

(iii)

Record the ammeter reading $I_0$ .

$I_0$ = ______

(iv)

Open the switch.

(b)

(i)

Select one of the resistors labelled with a numerical value and connect it between the crocodile clips on the component holder. Record the resistance $R$ of your selected resistor.

$R$ = ______ $\text{k}\Omega$

(ii)

Close the switch and record the ammeter reading $I$ .
Open the switch.

$I$ = ______

(c)

Repeat (b) using different labelled resistors until you have six sets of values of $R$ and $I$ .
Include values of $\frac{1}{R}$ in your table.

10M

(d)

(i)

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

(ii)

Draw the straight line of best fit.

(iii)

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

gradient = ______
$y$ -intercept = ______

(e)

The quantities $I$ and $R$ are related by the equation

I = \frac{a}{R} + \frac{a}{b}

where $a$ and $b$ are constants.

Using your answers from (d)(iii), determine the values of $a$ and $b$ .
Give appropriate units.

$a$ = ______
$b$ = ______

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Q2Manipulation, Measurement and Observation · Analysis, Conclusions and Evaluation · Presentation of Data and Observations20M

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