4263914
Frage 1
Frage
Soft magnetic materials are hard to magnetise but stay magnets for longer periods
Antworten
- True
- False
Frage 2
Frage
With a steady current in an electromagnet no e.m.f is needed because the magnetic field is not changing
Antworten
- True
- False
Frage 3
Frage
To make an electromagnet stronger one can...
Antworten
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put more coils on the wire
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run more electrical current through the wire
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use an iron core
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use a permanent magnet
Frage 4
Frage
When a magnet moves into a coil of wire, a voltage is induced and current flows...
What kind of current is this?
Antworten
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Direct Current (DC)
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Alternating Current (AC)
Frage 5
Frage
What is electromagnetic induction?
Antworten
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When a magnet cuts through a conductor resulting in a flow of current
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To start an alternating current of electricity using an electromagnet
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Creating an electromagnet out of a metal
Frage 6
Frage
If there are more coils on the primary coil than on the secondary coil it is [blank_start]a step down[blank_end]
Antworten
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a step down
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a step up
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a transformer
Frage 7
Frage
A.C p.d is produced in the...
Antworten
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secondary coil
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primary coil
Frage 8
Frage
The A.C in the [blank_start]primary coil[blank_end] produces [blank_start]an alternating[blank_end] magnetic field
Antworten
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primary coil
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secondary coil
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an alternating
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a direct
Frage 9
Frage
([blank_start]p.d[blank_end] across [blank_start]primary coil[blank_end] (v) / ([blank_start]p.d[blank_end] across [blank_start]secondary coil[blank_end] (v)) = ([blank_start]number of turns[blank_end] on [blank_start]primary coil[blank_end] / [blank_start]number of turns[blank_end] on [blank_start]secondary coil[blank_end])
Antworten
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p.d
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Amps
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primary coil
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secondary coil
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p.d
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Amps
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secondary coil
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primary coil
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number of turns
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e.m.f
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primary coil
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secondary coil
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number of turns
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e.m.f
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secondary coil
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primary coil
Frage 10
Frage
A long coil with many turns is called a [blank_start]solenoid[blank_end]
Antworten
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solenoid
Frage 11
Frage
Relays are used to break a circuit if the electrical current is too high
Antworten
- True
- False
Frage 12
Frage
Why is iron a better core to use for an electromagnet?
Antworten
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steel is a hard metal and would become permanently magnetised
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steel is a soft metal and would lose its magnetic ability to quickly
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steel is not magnetic
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