Physics 7.3.1

Question 1

The Generator Effect is described as the Opposite of the…

Answer 1

Motor Effect.

Question 2

Why is the Generator Effect described as the Opposite of the Motor Effect?

Answer 2

Instead of Using Electricity to Create Motion, Motion is being Used to Create Electricity.

Question 3

What is the ‘Generator Effect’?

Answer 3

If an Electrical Conductor Moves Relative to a Magnetic Field, or if there is a Change in the Magnetic Field Around a Conductor, a Potential Difference is Induced Across the Ends of the Conductor.

Question 4

If the Conductor is Part of a Complete Circuit in the Generator Effect, what happens?

Answer 4

If the Conductor is Part of a Complete Circuit, a Current is Induced in the Conductor.

Question 5

When does the ‘Generator Effect’ Occur?

Answer 5

The Generator Effect Occurs when a Wire Cuts Through the Magnetic Field Lines.

Question 6

When a Conductor (eg a Wire) is Moved Through a Magnetic Field, the Wire Cuts Through the MFLs. This induces a…

Answer 6

Potential Difference in the Wire.

Question 7

Explain the Process of ‘Moving an Electrical Conductor in a Fixed Magnetic Field’: (2)

Answer 7

-Conductor Cuts Through Magnetic Field Lines.

-This in turn Induces a Potential Difference in the Wire.

Question 8

A Potential Difference will be Induced in the Conductor if…

Answer 8

There is Relative Movement Between the Conductor & the Magnetic Field.

Question 9

Explain the Process of ‘Moving a Magnetic Field Relative to a Fixed Conductor’: (2)

Answer 9

-As the Magnet Magnet Moves through the Coil (Fixed Conductor), the Field Lines Cut Through the Turns on the Coil.

-This in turn Induces a Potential Difference in the Coil.

Question 10

What Piece of Equipment can be Used to Measure the Size of the Induced Potential Difference?

Answer 10

A Sensitive Voltmeter.

Question 11

What Factors Affect the Size of the Induced Potential Difference in the Generator Effect? (4)

Answer 11

-The Speed at which the Wire, Coil, or Magnet, is Moved.

-The Number of Turns on the Coils of Wire.

-The Size of the Coils.

-The Strength of the Magnetic Field.

Question 12

What Determines the Direction of the Induced Potential Difference in the Generator Effect?

Answer 12

The Orientation of the Poles of the Magnet.

Question 13

Increasing the Speed at which the Wire, Coil, or Magnet Moves will…

Answer 13

Increase the Rate at which the Magnetic Field Lines of the Coil are Cut. This will in turn Increase the Induced Potential Difference in the Wire. So therefore More Current is Produced in the Wire.

Question 14

Increasing the Number of Turns on the Coils in the Wire will…

Answer 14

Increase the Potential Difference Induced. So then More Current Produced in the Wire.

Question 15

Increasing the Area of the Coils will…

Answer 15

Increase the Potential Difference Induced. Because there will be More Wire to Cut Through the MFLs.

Question 16

Increasing the Strength of the Magnetic Field will…

Answer 16

Increase the Potential Difference Induced. So therefore More Current will be Produced in the Wire.

Question 17

What does ‘Lenz Law’ State:

Answer 17

The Direction of an Induced Potential Difference Always Opposes the Change that Produces it.

Question 18

What does ‘Lenz Law’ Mean?

Answer 18

It Means that Any Magnetic Field Created by the PD will Act so that is tries to Stop the Wire of Magnet from Moving. This Leads to the Work Done when Inserting the Bar Magnet into the Coil (Like Forces Repel).

Question 19

Explain how ‘The Generator Effect’ works: (4)

Answer 19

-A Coil of Wire is part of a Live Circuit (it is an Electromagnet).

-When a Bar Magnet’s NP is Inserted into the Coil, it Cuts Through the Magnetic Field Lines of the Coil.

-This Induces a Potential Difference in the Coil of Wire. So Electricity is Supplied to the Circuit (PD is Voltage, which pushes Current. So more PD = more Current = more Electricity).

-On the side, as the Bar Magnet’s NP is Inserted & Removed from the Coil, Work is being Done, so Energy (Joules, J) is Released to the Surrounding, or Dissipated. (Lenz’ Law).