In this experiment you will investigate an electrical circuit. You are provided with several groups of resistors connected in parallel. (a) Select a group of resistors and assemble the circuit shown in Fig. 1.1. A, B and C are crocodile clips. • Measure and record the length $L_0$ of the resistance wire between the ends of A and B, as shown in Fig. 1.1. $L_0$ = ______ (b) • Record the number $n$ of resistors in parallel connected in the component holder. $n$ = ______ • Close…

Physics 9702/33 — February/March 2018

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 an electrical circuit.

You are provided with several groups of resistors connected in parallel.

(a)

Select a group of resistors and assemble the circuit shown in Fig. 1.1.

Fig. 1.1

A, B and C are crocodile clips.

• Measure and record the length $L_0$ of the resistance wire between the ends of A and B, as shown in Fig. 1.1.

$L_0$ = ______

(b)

• Record the number $n$ of resistors in parallel connected in the component holder.

$n$ = ______

• Close the switch.

• Move C along the wire until the voltmeter reading is zero.

• Measure and record the distance $L$ between A and C when the voltmeter reading is zero, as shown in Fig. 1.1.

$L$ = ______

• Open the switch.

(c)

Select a different group of resistors and repeat (b) until you have at least six sets of values of $n$ and $L$ .
Record your results in a table.
Include values of $\frac{1}{n}$ and $\frac{1}{L}$ in your table.

10M

(d)

(i)

Plot a graph of $\frac{1}{L}$ on the $y$ -axis against $\frac{1}{n}$ 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 $L$ and $n$ are related by the equation

\frac{1}{L} = \frac{a}{n} + b

where $a$ and $b$ are constants.

Use your answers in (d)(iii) to determine the values of $a$ and $b$ .
Give appropriate units.

$a$ = ______
$b$ = ______

The rest of this paper

1 more questions

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

Loading the full paper…