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A-Level Physics AQA > 5. Electricity (Wip) > Flashcards

5. Electricity (Wip) Flashcards

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1
Q

Define ‘electric current’

A

The rate of flow of electric charge in a circuit.

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2
Q

What is currents SI unit?

A

Amps or amperes.

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3
Q

What is the equation symbol of current?

A

The letter I.

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4
Q

Define ‘Potential Difference’

A

Work done per unit charge flowing between two points in a circuit.

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5
Q

What is potential difference’s SI unit?

A

Volts or voltage.

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6
Q

What is the equation symbol of voltage?

A

The letter V.

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7
Q

Define ‘resistance’.

A

The opposition of a component to the flow if electric current through it.

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8
Q

What is resistance’s SI unit?

A

Ohms represented by Greek letter omega, Ω.

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9
Q

What is the equation symbol of ohms?

A

The letter R.

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10
Q

What does Ohm’s law state?

A

’ A conductor at constant temperature’s current will be directly proportional to its voltage.’

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11
Q

What is the equation for Ohm’s law?

A

V=IR

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12
Q

What is an Ohmic conductor?

A

Any conductor where the current is directly proportional to the voltage.

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13
Q

What does the VI graph of a resistor look like?

A

https://www.elevise.co.uk/uploads/9/8/0/2/98021560/screenshot-2021-08-09-at-09-00-37_2.png

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14
Q

What does the VI graph of a filament lamp look like?

A

https://www.elevise.co.uk/uploads/9/8/0/2/98021560/screenshot-2021-08-09-at-09-00-37_2.png

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15
Q

What does the VI graph of a diode look like?

A

https://www.elevise.co.uk/uploads/9/8/0/2/98021560/screenshot-2021-08-09-at-09-00-37_2.png

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16
Q

What is resistivity?

A

A property of a material which determine how much resistance is has to the flow of charge of electrons.

17
Q

Why does resistivity occur?

A

Free electrons in a wire collide with ions resulting in a loss of kinetic energy upon collision causing electrical heating.

Example: https://cdn.savemyexams.com/cdn-cgi/image/w=640,f=auto/uploads/2020/09/9.3.1-Electrons-and-resistance.png

18
Q

What is the relationship between temperature and resistance?

A

The greater the temperature the higher resistance due to electrons colliding with vibrating ions for conductors which obey ohms law.

19
Q

What is a thermistor?

A

A non-ohmic conductor which when temperature is higher, resistance decreases.

20
Q
A

A-Level Physics AQA (2 decks)

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