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GCSE Physics > Physics: Electricity > Flashcards

Physics: Electricity Flashcards

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1
Q

What is Current

A

Flow of electrical charge

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2
Q

What is current measured in

A

Ampere A

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3
Q

What is Potential Difference

A

Driving force that pushes the charge round

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4
Q

What is Potential Difference measured in

A

Volt V

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5
Q

What is Resistance

A

Electrical force that slows down the flow

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6
Q

what is resistance measured in

A

Ohms (Omega symbol)

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7
Q

What does Q=IT mean

A

Charge flow (coulombs C) = Current (A) x time (s)

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8
Q

What is the potential difference formula

A

Potential Difference (V) = Current (I) x Resistance (R)

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9
Q

What is the Potential difference in a Series Circuit

A

Potential Difference is shared so Vt = V1 + V2 + ….

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10
Q

What is the Current in a Series Circuit

A

Current is the same everywhere so I1 = I2 = ….

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11
Q

What is the Resistance in a series Circuit

A

Resistnace adds up Rt = R1 + R2

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12
Q

What is the Potential difference in a Parallel Circuit

A

Potential Difference is the same everywhere so V1 = V2 = ….

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13
Q

What is the Current in a Parallel Circuit

A

Current is shared between branches It = I1 + I2 + ….

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14
Q

What three wires are in a plug

A

Live Wire, Neutral Wire, Earth Wire

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15
Q

Describe the Live Wire

A

Brown wire that provides the alternating potential difference (230V) from the mains supply

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16
Q

Describe the Neutral Wire

A

Blue wire that completes the circuit and carries current away

17
Q

Describe the Earth Wire

A

Green and Yellow that is used for safety. It only carries current when there is a fault

18
Q

What are the energy transferred formulaes

A

E = Pt Energy transferred = Power x time or

Energy transferred = Charge flow x Potential difference E = QV

19
Q

What are the two Power equations

A 
P = VI Power = Potential difference x Current or 
P = I2R Power = Current squared x Resistance
20
Q

What is the voltage of the National Grid

A

230V

21
Q

What is the frequency of the National grid

A

50Hz

22
Q

What is Static electricity

A

The charges are not free to move which causes them to build up and spark

23
Q

What causes Static electricity

A

Friction

24
Q

What happens to positive charges and electrons in static electricity

A

The positive charges never move only the electrons

25
Q

What do two objects with opposite electric charges do

A

repel each other

26
Q

What do two objects with same electric charges do

A

attract each other

27
Q

How do sparks happen

A

Caused when there is a high enough potential difference between a charged object and an earthed object

GCSE Physics (9 decks)

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