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Physics Unit 2 > Electrical Circuits > Flashcards

Electrical Circuits Flashcards

1
Q

What is electric current?

A

A flow of electric charge

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2
Q

What is the size of an electric current?

A

The rate of flow of an electric charge

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3
Q

Units of current?

A

A (Amps)

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4
Q

Units of charge?

A

C (Coulombs)

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5
Q

Units of time taken?

A

s

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6
Q

What is potential difference?

A

(Between two points) is the work done per coulomb of charge that passes between the points

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7
Q

Units of potential difference?

A

V

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8
Q

What are current- potential difference graphs used to show?

A

How current through a component varies with the potential difference across it

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9
Q

How can the resistance of a component be found?

A

By measuring the current through, and the potential difference across the component

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10
Q

What is the current through a resistor directly proportional to?

A

Potential difference across the resistor

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11
Q

Units of resistance?

A

Ω (ohms)

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12
Q

For a given potential difference, the greater the resistance…

A

The smaller the current

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13
Q

What is the total resistance? (series)

A

Sum of the resistance for each component

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14
Q

The total potential difference of supply… (series)

A

Is shared equally between components

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15
Q

What is the current through each component? (series)

A

The same

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16
Q

What is the potential difference across each component? (parallel)

A

The same

17
Q

What is the total current through the whole circuit? (parallel)

A

Sum of the currents through the separate components

18
Q

What happens to temperature as the resistance of a filament bulb increases?

A

It increases

19
Q

Why does the temperature increase cause the resistance to increase?

A

Heat energy causes the ions in the conductor to vibrate more, making it more difficult for charge-carrying electrons to get through resulting in resistance to increase

20
Q

Why does the graph of a filament lamp level off?

A

There’s a limit to the amount of current that can flow through, and more current causes a temp. increase which increases resistance causing the current to decrease

Physics Unit 2 (16 decks)

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