The Motor Effect Flashcards

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1
Q

What happens when a Current flows through a wire?

A

A magnetic field will be produced around the wire

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2
Q

What is the strength of the magnetic field generated by a wire dependant on?

A

The size of the current
The distance from the wire

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3
Q

What is the right hand grip rule?

A

When your thumb is pointing along the direction of conventional current, the other four fingers show the direction of magnetic field

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4
Q

How can the direction of the magnetic field of a solenoid determined by?

A

The right-hand grip rule (for straight wires or for solenoids)

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5
Q

How can you use the right hand rule for solenoids?

A

Grip the solenoid so that the curling fingers, curl in the direction of the current, the thumb will show the direction if the magnetic field

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6
Q

How can the strength of a magnetic field produced around a solenoid be increased?

A

Increasing the current

Using more turns of wire

Moving the turns closer together

Putting a soft iron core into the middle of the solenoid

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7
Q

What happens when a Current flows through a solenoid?

A

It becomes an electromagnet

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8
Q

When a conductor carrying a Current is placed into a magnetic field, what happens?

A

The conductor and the magnets producing the field will exert a force on one another

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9
Q

How can you determine the direction of the force exerted on a conductor when placed in a magnetic field?

A

Fleming’s left hand rule

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10
Q

What does each finger direct in Fleming’s left hand rule?

A

Thumb=force
Index=magnetic field
Middle=conventional current

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11
Q

What is the name of the quantity used when talking about the strength of a magnetic field?

A

Flux density

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12
Q

What are magnetic field lines called in magnetic flux density?

A

Lines of magnetic flux

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13
Q

What does it mean if lines of magnetic flux density are more closely packed?

A

Higher magnetic flux density

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14
Q

What is the unit for magnetic flux density

A

Tesla (T)

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15
Q

What us the symbol and unit of B, I And l?

A

B=magnetic flux density, T
I=current, Amps
l=length of conduct, m

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16
Q

Which way is the coil forced in left and right in an electrical motor?

A

Left=upwards
Right=downwards

This causes the wire to rotate in a clockwise direction

17
Q

How can you reverse the rotation of the motor?

A

Reverse direction of the magnetic field
Reversing the polarity of the battery

18
Q

In which direction does the split-ring communicator rotate?

A

Rotates with the cil between the carbon brushes

19
Q

What happens when the coil passe the vertical position?

A

The direction in which current flows around the could reverses, which allows for continuous rotation