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Science > Electricity and magnetism: > Flashcards

Electricity and magnetism: Flashcards

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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?

A

Long

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
Q

How is an electromagnet made?

A

By wrapping a wire around an electric core

26
Q

What affects the strength of electromagnets?

A

Current
Number of coils
type of magnetic core

27
Q

What is potential difference?

A

The energy transferred per unit charge as charges flow between two points on a circuit

28
Q

What is current?

A

The rate of flow of charge

29
Q

What is charge caused by?

A

Atoms losing or gaining electrons

30
Q

How do you calculate current?

A

Current ( L ) = potential difference ( V )/resistance ( R )

31
Q

How do you calculate potential difference?

A

Potential difference ( V ) = Current ( L ) x Resistance ( R )

32
Q

What is energy?

A

The potential to do work

33
Q

What is the formula for energy?

A

Work force x distance

Science (7 decks)

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