In this experiment, you will investigate how the voltage across components in a circuit varies as the resistance of the circuit is changed. (i) Set up the circuit as shown in Fig. 1.1. Attach the crocodile clips to the wire so that the distance $x$ is approximately 30 cm. (ii) Measure and record $x$. $x$ = \_\_\_\_\_\_ (i) Close the switch. (ii) Record the voltmeter readings $V_1$ and $V_2$. $V_1$ = \_\_\_\_\_\_ $V_2$ = \_\_\_\_\_\_ (iii) Open the switch. (c) Change $x$ and…

Physics 9702/35 — May/June 2015

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

In this experiment, you will investigate how the voltage across components in a circuit varies as the resistance of the circuit is changed.

(a)

(i)

Set up the circuit as shown in Fig. 1.1.

Fig. 1.1

Attach the crocodile clips to the wire so that the distance $x$ is approximately 30 cm.

(ii)

Measure and record $x$ .

$x$ = ______

(b)

(i)

Close the switch.

(ii)

Record the voltmeter readings $V_1$ and $V_2$ .

$V_1$ = ______
$V_2$ = ______

(iii)

Open the switch.

(c)

Change $x$ and repeat (a)(ii) and (b) until you have six sets of readings of $x$ , $V_1$ and $V_2$ .

Include values of $\frac{V_2}{V_1}$ in your table.

10M

(d)

(i)

Plot a graph of $\frac{V_2}{V_1}$ on the $y$ -axis against $x$ 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 $V_2$ , $V_1$ and $x$ are related by the equation

\frac{V_2}{V_1} = \frac{Ax}{P} + \frac{Q}{B}

where $P = 15\ \Omega$ , $Q = 10\ \Omega$ and $A$ and $B$ are constants.

Use your answers in (d)(iii) to determine values for $A$ 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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