Give two ways you can reverse the direction of a basic dc motor?

Keep the magnetic field the same

The magnetic field inside a long straight solenoid carry ing current is

decreases as we move towards its end

increases as we move towards its end

Force experienced by a current carrying conductor placed in a magnetic field is

Perpendicular to its length & magnetic field

Perpendicular to its magnetic field

In Flemings Left hand rule what does the thumb point in the direction of?

The direction of the force (movement)

The direction of the magnetic field

Primary winding of a transformer is determined by _________.

which winding is connected to the source

which winding is nearer to the load

which side has the highest voltage

Why transformers work with A.C. current but not D.C.

A.C current produces changing magnetic field.

D.C current produces changing magnetic field.

The function of a transformer is to ...

increase or decrease A.C voltage or A.C current levels

raise and lower the apparent power levels

transfer DC voltage from the primary winding to the secondary winding

transform mechanical energy into electrical energy

Choose the correct statement:

The ratio of the number of turns in the secondary winding to the number of turn in the primary winding determine the type of the transformer

The efficiency of a transformer is the percentage of the ratio of its input power to the output power

The ratio of the input apparent power to the output apparent power is less than 1 for a practical transformer

Copper loss is due to eddy current in the core

How can the direction of an induced potential be reversed?

By changing the direction of the magnetic field

By changing the direction of the magnetic field, and moving the magnet in the opposite direction

How can the voltage output from an alternator be doubled?

Halve the speed of rotation but reverse the direction of rotation

Reverse the direction of rotation

In a dynamo, what is the function of the split ring commutator?

It reverses the coil connections every half turn, to keep the output current in the same direction all the time

It strengthens the magnetic field to make a greater output current for the same rotation speed

It reverses the connections every half turn, to keep the output current alternating every half turn

It prevents the coil from overheating

What is the function of a microphone?

It converts sound waves into electrical signals

It converts electrical signals into sound waves

It converts alternating current signals into direct current signals

It converts direct current signals into alternating current signals

How does a moving-coil microphone create electrical signals?

A coil of wire vibrates in a magnetic field

An electromagnet vibrates inside a coil of wire

A magnet vibrates inside a coil of wire

A small battery vibrates in a circuit

How can the voltage output from a dynamo be doubled?

Reverse the direction of rotation

Halve the speed of rotation but reverse the direction of rotation

Transformers, Motor Effect and the Generator Effect

Authored by Stanton Wertjes

Physics

10th Grade

NGSS covered

Used 15+ times

Transformers, Motor Effect and the Generator Effect

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why might a current-carrying wire be placed between a magnetic field?

To increase the current from the interaction of magnetic fields

To increase the voltage from the interaction of magnetic fields

To produce a force from the interaction of magnetic fields

Tags

NGSS.HS-PS2-5

MULTIPLE SELECT QUESTION

30 sec • 1 pt

What does the thumb indicate in flemings left hand rule?

Force

Motion

Current

Magnetic field direction

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What direction is the force/motion in the following diagram?

Perpendicular to the magnets

Downwards

Parallel and through the magnets

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What angle must there be between a magnetic field and a conductor in order for the maximum force to be exerted?

180

270

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Name one factor that does not affect the size of a force in on a current-carrying conductor placed in a magnetic field?

Gravity

Magnetic flux density/size of magnetic field

Size of the current

Length of the conductor

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Name the effect that causes a coil of current-carrying wire in an electric motor to move.

The electromagnetism effect

The magnetic effect

The motor effect

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which rule can be used to work out which way a coil of wire rotates in a motor?

Fleming's left-hand rule

Fleming's right-hand rule

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

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Transformers, Motor Effect and the Generator Effect

Why might a current-carrying wire be placed between a magnetic field?

What does the thumb indicate in flemings left hand rule?

What direction is the force/motion in the following diagram?

What angle must there be between a magnetic field and a conductor in order for the maximum force to be exerted?

Name one factor that does not affect the size of a force in on a current-carrying conductor placed in a magnetic field?

Name the effect that causes a coil of current-carrying wire in an electric motor to move.

Which rule can be used to work out which way a coil of wire rotates in a motor?

Give two ways you can reverse the direction of a basic dc motor?

What does the thumb indicate in flemings left hand rule?

The current in the green wire flows from the left to the right. What direction does the wire move?

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