Electricity and magnetism: Flashcards

1
Q

Which atoms can be transferred?

A

Electrons

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2
Q

What charge do neutrons have?

A

Neutral

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3
Q

What charge do protons have?

A

Positive

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4
Q

What charge do electrons have?

A

Negative

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5
Q

Where are electrons located in the nucleus?

A

they surround the nucleus

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6
Q

Where are protons/neutrons located in the nucleus?

A

The outside

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7
Q

When two electrons with the same charge are close what happens?

A

They repel

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8
Q

When electrons with different charges are close what happens?

A

They attract

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9
Q

What tells you the number of electrons and protons in an atom?

A

The big number in an atom on the periodic table

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10
Q

How do you tell the number of neutrons and protons in an atom?

A

The big number - the small number

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11
Q

What does the group in the periodic table tell us?

A

how many electrons on the outer shell

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12
Q

What is potential difference?

A

The size of the push of the battery

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13
Q

What do you call 2 or more cells joined together?

A

A battery

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14
Q

What are 3 factors that affect resistance:

A

Temperature
Length of wire
thickness of wire

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15
Q

What is resistance?

A

A measure of how difficult it is for current to flow

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16
Q

What is the formula to calculate resistance?

A

Resistance ( R ) = potential difference ( V )/current ( L )

17
Q

What three elements are attracted to magnets?

A

Iron, cobalt and nickel

18
Q

What do North poles attract?

A

South poles

19
Q

What do North poles repel?

A

North poles

20
Q

What do South poles attract?

A

North poles

21
Q

What do South poles repel?

A

South poles

22
Q

Do long or short wires have higher resistance?

23
Q

What is current?

A

The rate of flow of charge

24
Q

How is a battery different to a cell?

A

A battery contains electrical energy which is presupplied from a factory, while cells contain a chemical energy source such as natural gas

25
How is an electromagnet made?
By wrapping a wire around an electric core
26
What affects the strength of electromagnets?
Current Number of coils type of magnetic core
27
What is potential difference?
The energy transferred per unit charge as charges flow between two points on a circuit
28
What is current?
The rate of flow of charge
29
What is charge caused by?
Atoms losing or gaining electrons
30
How do you calculate current?
Current ( L ) = potential difference ( V )/resistance ( R )
31
How do you calculate potential difference?
Potential difference ( V ) = Current ( L ) x Resistance ( R )
32
What is energy?
The potential to do work
33
What is the formula for energy?
Work force x distance