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By:
Sam TheHen
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Decks in this class (20)
Give one reason why an electromagnet would be used rather than a permanent magnet.
an electromagnet can be
switched off
or
an electromagnet is stronger
48
cards
Describe how the students could build an electromagnet. Include in your answer how the students should vary and test the strength of their electromagnet.
Details of how to make an electromagnet
• wrap the wire around the nail
• connect the wire to the power supply (with
connecting leads and croc clips)
Details of how to vary the strength of the electromagnet
• change the number of turns (on the coil) • change the current (through the coil)
26
cards
2 (a) There is an alternating current in the primary coil of the transformer. State what is produced in the iron core.
a magnetic field
that is alternating / changing
0
cards
(1)A transformer has only one turn of wire on the secondary coil. The potential difference across the secondary coil is 11.5 V The potential difference across the primary coil is 230 V
2(b) 20 allow 1 mark for correct
substitution, ie
230
11.5
provided no subsequent step
0
cards
(2)Calculate the number of turns on the primary coil.
0
cards
In most transformers, the power output is less than the power input. State why.
(most) transformers are not
100% efficient
0
cards
State the resolution of the voltmeter. Give one reason why the resolution of the voltmeter is suitable for this investigation
0.01 (V) because there is a change in
p.d. each time (the number of
turns changes)
0
cards
Both students recorded their results correctly. Give the reason why student 2 got different results from student 1.
student 2 moved the coil more
slowly (than student 1)
0
cards
The students decided that even though the results were different, there was no need to repeat the investigation. How do the results show that the investigation is reproducible?
both sets of results show the
same pattern
0
cards
State the name of the process which causes the potential difference to be produced in this investigation.
(electromagnetic) induction
0
cards
A transformer has been developed that can be used with many different devices. Suggest one advantage of having a transformer that can be used with many different devices.
any one from: • more economical / cheaper
for the consumer
• easier/cheaper to replace if
broken/lost
• since fewer transformers
need to be made less
resources are used
0
cards
Ultrasound is used to scan unborn babies but X-rays are not used to scan unborn babies. Explain why.
ultrasound is not ionising
but X-rays are ionising
so X-rays increase the health
risk to the (unborn) baby
0
cards
The behaviour of ultrasound waves when they meet a boundary between two different materials is used to produce an image. Describe how.
ultrasound/waves are partially
reflected
(when they meet a boundary)
(between two different media /
substances / tissues) the time taken is measured
(and is used to determine
distances)
0
cards
The closest distance between the unborn baby and the mother’s skin is 4.0 cm. calculate the average speed of the pulse.
1600 (m/s)
800 (m/s) gains 2 marks
160 000 (m/s) gains 2 marks
0.0016 (m/s) gains 2 marks
allow 2 marks for 0.04
25 ×10-6
0
cards
Describe how X-rays are able to produce an image of bones
they are absorbed by bone
they are transmitted by soft
tissue
(the transmitted) X-rays are
detected
0
cards
X-rays are able to produce detailed images because their wavelength is very ________________________ .
Short
0
cards
Which one of the following pairs of angles correctly identifies the angle of incidence and the angle of refraction?
angle of incidence: A
angle of refraction: D
9
cards
The glass used to make this optical fibre has a refractive index of 1.5. Calculate the critical angle of the glass. Give your answer to 2 significant figures
42 (degrees)
0
cards
Electromagnet
Electromagnetic hyperlearning,
Electromagnetic waves are transve...,
There is a continuous spectrum of...
4
cards
*Currents
Https studylibnet doc 9545998 dat...
1
cards
More about
Physics
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