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Edexcel | Physics 4PH0 | W 17 1 | Q5

W 17 1

5

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A student sets up a circuit to investigate how the current in different components

varies with voltage.

He investigates these components.

● a short thick copper wire

● a filament lamp

● a long thin copper wire

● a diode

W 17 1

5

(a)

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4 Mark s

State four other pieces of equipment the student needs.

any four in any order

voltmeter;

ammeter;

power supply;

variable resistor/connecting wires/switch;

accept battery

accept variable

power supply for

2 marks

W 17 1

5

(b)

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During the investigation, the student keeps the two copper wires at a

constant temperature.

W 17 1

5

(b) (I)

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1 Mark

Give a reason why he should keep the wires at a constant temperature.

any 1 of the following:

MP1. resistance changes with temperature;

MP2. temperature affects current;

MP3. the wire will get hot because of the

current;

W 17 1

5

(b) (II)

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2 Mark s

Describe how he could keep the wires at a constant temperature.

any suitable method;

further detail;

e.g.

use a switch

only on for short time

allow wire to cool between readings

use only low current

allow water bath

W 17 1

5

(c)

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3 Mark s

The student obtains a graph for each component.

Draw a straight line linking each component to its correct graph.

4 correct lines score 3 marks;;;

2 or 3 correct lines score 2 marks;;

1 correct line scores 1 mark;

-1 if multiple lines drawn to or from the same

box

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