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G10 SCIENCE QUIZZES & SEATWORKS > Q2: Science Long Test 1 > Flashcards

Q2: Science Long Test 1 Flashcards

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1
Q

What is electricity?

A

the interaction of electric charges

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2
Q

Do protons have a positive or negative charge?

A

Positive

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3
Q

Do electrons have a positive or negative charge?

A

Negative

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4
Q

What is the law of electric charges?

A

The attraction or repulsion between objects.

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5
Q

Definition of static electricity

A

The build up of electric charges on an object

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6
Q

What is electric discharge

A

The release of electrons from a fully charged object to a positive charged object known as the conductor

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7
Q

What is an electric current

A

The flow of electrons - this can be on a conductor

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8
Q

Direct Current (DC) Definition

A

The flow of electricity in one direction only.

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9
Q

Alternating Current (AC) Definition

A

Flows in one direction, then reverses repeatedly.

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10
Q

What is a conductor?

A

A material that allows current to flow through easily

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11
Q

What is an insulator?

A

A material that resists the flow of electric current.

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12
Q

He was the one who discovered that electric currents produce a magnetic field

A

Hans Orested

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13
Q

They discovered that if an electric current produces a magnetic field, then a changing magnetic field creates an electric current.

A

Michael Faraday and Joseph Henry

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14
Q

What is an electromagnet?

A

A coil of wire around an iron rod

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15
Q

What is induced EMF

A

EMF created because of the change in the magnetic environment around the conductor

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16
Q

Define EMF

A

The “force” that pushes electrons through the conductor, creating an electric current || However, there is not really any force, it’s just pressure.

17
Q

This law states that the change in strength of magnetic field (magnetic flux) induces a current, hence creating induced emf

A

Faraday’s Law

18
Q

This law states that the magnetic field of the induced current will push back/repel against the change of the original magnetic field

A

Lenz Law

19
Q

What does Coulomb’s Law state?

A

The size of charges and distance between electric charges are the factors in determining the strength of the electric force.

20
Q

Function of Magnets in an AC Generator

A

The magnet is used as an magnetic field to create electricity

21
Q

Function of Armature Coil in an AC Generator

A

Produces an electric current when it turns in a magnetic field

22
Q

Function fo Slip rings in an AC Generator

A

Used to transfer electric power from stator to circuit

23
Q

Function of Carbon Brushes in an AC Generator

A

Conducts an electric current, and makes contact with slip rings

24
Q

Function of the load in AC generator

A

thing being powered by the generator

25
Q

Function of Magnets in DC Generator

A

The stator which is the stationary component found in electric motors and generators

26
Q

Function of Armature Coil in DC Generators

A

Connected in series to enhance the sum of current

27
Q

What happens to Mechanical energy in a Motor/Generator

A

Gets converted into Electrical Energy

28
Q

Function of Commutator/Slip Ring in a DC Generator

A

Applies an electric current to the windings

29
Q

What are the 3 stages in producing electricity?

A

Generation, Transmission, and Distribution

30
Q

Describe the step down transformer

A

More coils on the primary side than the secondary side
3:1 ratio

31
Q

Describe the step up transformer

A

More on the secondary side, less on the primary side
1:3 ratio

32
Q

Explain how the transformer operation works.

A

When AC Voltage is applied to the primary coil, the current flows through it creating a change in magnetic field.

  1. The magnetic core guides the change of magnetic field
  2. the magnetic field circles the secondary coil and induces a magnetic current. → the result of this is that the voltage applied to the primary coil is therefore transformed into a different voltage in the secondary coil.
33
Q

Explain Mutual Inductance

A

Principle which allows transformers to work.

34
Q

An Electric Motor does what?

A

Does the reverse of a generator: Changes electrical energy into mechanical energy.

G10 SCIENCE QUIZZES & SEATWORKS (3 decks)

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