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Edexcel | Physics 4PH0 | W 17 1 | Q7

W 17 1

7

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A filament lamp is connected to a battery.

The lamp is switched on and a data logger records the current.

The graph shows the results from the data logger.

W 17 1

7

(a)

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3 Mark s

Describe in detail how the current varies with time.

Refer to data from the graph in your answer.

any three of the following:

MP1. current increases during first

0.04s/ to maximum of 0.4A;

MP2. current increase is linear

/proportionate to time;

MP3. (then) current drops for next 0.44s

/ by 0.48s;

MP4. current decrease is nonlinear;

MP5. (final)current constant value is 0.2

A/ from 0.48s onwards;

allow ‘at first’ for

first 0.04s

allow 0.5s

W 17 1

7

(b)

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The battery has a voltage of 12 V.

The lamp reaches its normal operating temperature after a short while.

W 17 1

7

(b) (I)

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1 Mark

State the current in the lamp when it is at its normal operating temperature.

current = ............................................. A

0.2 A;

W 17 1

7

(b) (II)

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1 Mark

State the relationship between voltage, current and resistance.

V= I R;

accept words or

standard symbols

W 17 1

7

(b) (III)

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4 Mark s

Calculate the resistance of the lamp at its normal operating temperature.

Give the unit.

resistance = ............................................. unit .............................................

substitution;

rearrangement;

evaluation;

unit;

e.g.

12 =0.2R

R= 12/0.2

=60

accept ecf from

bi

independent mark

W 17 1

7

(b) (IV)

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1 Mark

State the relationship between power, current and voltage.

P= IV;

accept words or

standard symbols

W 17 1

7

(b) (V)

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2 Mark s

Calculate the power of the lamp at its normal operating temperature.

power = ............................................. W

substitution;

evaluation;

e.g.

P= 0.2 12

2.4 (W)

accept ecf from

bi

W 17 1

7

(c)

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2 Mark s

Suggest why a filament lamp is most likely to fail when it is first switched on.

filament heats up very rapidly (at the

start);

causing it to melt/ break;

allow wire for

filament

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