Physics 9702/31 — May/June 2010

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

questions

marks

120

minutes

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

Q1Manipulation, Measurement and ObservationAnalysis, Conclusions and EvaluationPresentation of Data and ObservationsFree sample

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

In this experiment, you will measure the potential difference (p.d.) across a set of resistors in series and the current through the resistors.

(a)

Measure and record the e.m.f. of the power supply.

e.m.f. = ______ $\text{V}$

(b)

(i)

Connect the circuit of Fig. 1.1, ensuring that the movable lead is connected between resistors 1 and 2.

Fig. 1.1

(ii)

Close the switch and record the voltmeter reading $V$ and the ammeter reading $I$ .

After recording your results, open the switch.

$V$ = ______ $\text{V}$
$I$ = ______ $\text{A}$

(iii)

Using your answer to (b)(ii), calculate the total resistance $R$ of resistor P in series with resistor 1.

R = \frac{V}{I}

$R$ = ______ $\Omega$

(c)

By adjusting the movable lead, the resistor P may be connected in series with a number $N$ of other resistors, giving different values of the total resistance $R$ . In (b), $N = 1$ .

Repeat (b)(ii), for different values of $N$ , until you have six sets of readings for $N$ , $V$ and $I$ .

Include values of $\frac{1}{R}$ in your table of results.

(d)

(i)

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

(ii)

Draw the line of best fit.

(iii)

Determine the gradient and $y$ -intercept of the line of best fit.

gradient = ______
$y$ -intercept = ______

(e)

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

I = \frac{M}{R} + L

where $M$ and $L$ are constants.

Using your answers from (d)(iii), determine values for $M$ and $L$ . You should include units where appropriate.

$M$ = ______
$L$ = ______

The rest of this paper

1 more questions

Q2Manipulation, Measurement and Observation · Analysis, Conclusions and Evaluation

Loading the full paper…