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x Standard Grade Physics > USING ELECTRICITY Movement Of Electricity > Flashcards

USING ELECTRICITY Movement Of Electricity Flashcards

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0
Q

______ exist around a current carrying wire

A

Magnetic fields

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1
Q

Parts of an electric motor (4)

A

Commutator, field cool, brushes and rotating coil

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2
Q

Magnetic field uses

A

electric bells, electromagnets, relays

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3
Q

Advantages of electromagnets

A

Can be switched off

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4
Q

A current carrying wire experiences ____ when placed in a magnetic field.

A

Force

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5
Q

What does the force in a current carrying wire depend on?

A

The direction of the current and the magnetic field.

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6
Q

How would you reverse the direction of force?

A

Reverse directing of current/magnets

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7
Q

What do field coils do?

A

Produce a magnetic field

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8
Q

Rotating coils

A

Carry the magnetic field so that there is a force on the coil

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9
Q

Commutator

A

To ensure the motor keeps tiring in one direction in changes direction every half turn

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10
Q

What do brushes do?

A

Provide electric current with good contact

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11
Q

In a commercial motor what differences are there with normal electric motor?

A

Carbon brushes, field coils, mulstinsection commutator

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12
Q

Why does a commercial motor have carbon brushes

A

Good contact but reduced wear and withstand high temperatures.

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13
Q

Why does a commercial motor have field coils

A

Stronger

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14
Q

Why does a commercial motor have multiple section commutator

A

Smooth turning (hundreds of turns)

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15
Q

What is a permanent magnet?

A

A magnet who’s magnetic field cannot be switched on and off

16
Q

_____ poles repel and _____ poles attract.

A

Like poles repel and unlike poles attract.

17
Q

If you increase the current through the wire what happens to the strength of the magnetic field?

A

It increases

18
Q

How can an electromagnet be made stronger?

A

Increasing the number of coils of the wire, increasing the current

19
Q

Why would a relay be used?

A

When is small current circuit is used to control a switch in a high current circuit.

x Standard Grade Physics (29 decks)

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