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Science > Physics Electromagnism > Flashcards

Physics Electromagnism Flashcards

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1
Q

Name the meter that you use to measure potential difference?

A

Voltmeter.

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2
Q

What is potential difference?

A

Potential difference (or voltage) is a measure of energy, per unit of charge, transferred between two points in a circuit.

Energy ‘lost’ to components.

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3
Q

What does the potential difference across a cell tell you?

A

1) the size of the force on charges.
2) the energy transferred by the cell to the charges.
3) the energy transferred by the charges to the components in the circuit.

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4
Q

Potential difference is measured in …

A

volts (V)

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5
Q

What is a cell rating?

A

The value of potential difference at which a cell or bulb operates.

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6
Q

The value of potential difference at which a cell or bulb operates is called….

A

a cell rating.

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7
Q

Define volts.

A

Unit of measurement of potential difference (voltage). symbol = V

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8
Q

What is the equation to work out potential difference?

A

Potential difference = current multiplied by resistance.

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9
Q

What is current measured with?

A

An ammeter

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10
Q

What is the unit for current?

A

Amperes or amps

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11
Q

Why does the voltmeter need to be parallel to the component?

A

A parallel connection is used because objects in parallel experience the same potential difference.

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12
Q

Define resistance.

A

A property of a component, making it difficult for a charge to pass through. Measured in ohms.

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13
Q

What is the unit of measurement for resistance?

A

Ohms.

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14
Q

What is the current…

A

The amount of charge flowing per second.

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15
Q

How can you calculate the current?

A

Potential difference (V)
———————————
Resistance (ohms)

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16
Q

As you add more bulbs to a series circuit, the current will…

A

Decrease.

Adding more bulbs increases the resistance so the current is less.

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17
Q

How can you calculate resistance?

A

Potential difference (V)
———————————
Current (A)

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18
Q

Electrical conductors (such as metals) have a very …… resistance because they contain lots of electrons that can move.

A

Low.

19
Q

Electrical insulators (like plastic) have very …. resistance because they do not have many electrons that are free to move.

A

High.

20
Q

Define an electrical conductor.

A

A material that allows current to flow through it easily and has a low resistance.

21
Q

Define an electrical insulator.

A

A material that does not allow current to flow through it easily and has a high resistance.

22
Q

Electrons have a …… charge.

A

Negative.

23
Q

Protons have a …… charge.

A

Positive.

24
Q

Neutrons have …… charge.

A

No.

25
Q

Electrons and what attract?

A

Protons.

26
Q

Protons and what repel?

A

Protons.

27
Q

Positive charges…..positive charges.

A

Repel.

28
Q

Negative charges repel what?

A

Negative charges.

29
Q

Positive charges….negative charges.

A

Attract.

30
Q

Atoms contain what numbers of protons and electrons?

A

Equal numbers.

31
Q

What charge does at atom have?

A

Overall, an atom has no charge. It is neutral.

32
Q

What happens when you rub a balloon on your jumper?

A

Some electrons are transferred from the jumper to the balloon.

The balloon is charged up and it now has more electrons than protons to that it is negatively charged.

The jumper is positively charged.

33
Q

Define atom.

A

The smallest part of a chemical element than can exist.

34
Q

Define electron.

A

Tiny particles that are part of atoms and carry a negative charge.

35
Q

Define proton.

A

Tiny particles that are part of atoms and carry a positive charge.

36
Q

Define an electric field.

A

A region where a charged material or particle experiences a force.

37
Q

Define attract.

A

Be pulled together. For example, positive and negative charges attract.

38
Q

Define repel.

A

Be pushed away from each other. For example, like magnetic poles or like electric charges repel.

39
Q

Define electro static force.

A

Non-contact force between two charged objects.

40
Q

What is a series circuit?

A

If components in a circuit are in the same loop in an electrical circuit.

41
Q

What is a parallel circuit?

A

If some components are in separate loops in an electrical circuit.

42
Q

What happens to potential difference in a series circuit?

A

The p.d across the voltmeter tells you that as the p.d of the battery is the result of the p.d in each of the components. The p.d.s. add up to the voltage of the battery

43
Q

What is the Greek symbol for ohms?

A

Ω

Science (15 decks)

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