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A-Level Physics > Electricity > Flashcards

Electricity Flashcards

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1
Q

What is Ohm’s law?

A

Voltage = current x resistance

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2
Q

1 volt =

A

1 volt = 1 joule per coulomb of charge moved

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3
Q

Voltage is the…

A

Voltage is the work done per unit charge moved

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4
Q

Charge =

A

Charge = current x time

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5
Q

Current through ohmic conductor is directly proportional to…

A

Current through ohmic conductor is directly proportional to potential difference across it

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6
Q

Resistivity =

A

Resistivity = (resistance x cross-sectional area) / length

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7
Q

Area of a circle =

A

Area of a circle = pi x r squared

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8
Q

Power =

A

Power = energy / time

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9
Q

Power in electrical circuits =

A

Power in electrical circuits = voltage x current

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10
Q

Energy transferred =

A

Energy transferred - power x time

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11
Q

Define current

A

Rate of flow of charge

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12
Q

What is 1 coulomb

A

The amount of current that passes in 1 sec if the current is 1 amp

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13
Q

What is the property of an ohmic conductor

A

Current through it is proportional to the pd across it, providing external conditions are constant

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14
Q

What are NTC thermistors

A

Negative temp coefficient, where resistance falls and temperature rises

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15
Q

What are diodes designed to do

A

Limit the current flow to one direction

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16
Q

Define resistivity

A

The resistance of a 1m length with a 1m² cross-sectional area

17
Q

What is resistivity measured in

A

Ohm-metres

18
Q

2 uses of superconductors

A

Power cables to transmit energy without losing power

Electrical circuits with no resistance

19
Q

What is a superconductor and how it it created

A

A material without any resistance, formed by cooling a material below its transition temp, causing resistivity to disappear

20
Q

Define power

A

The rate of energy transfer (energy/time)

21
Q

What effect on the resistance of an LDR does increasing the light intensity have

A

LDR resistance falls

22
Q

Define EMF

A

The amount of electrical energy battery produces per each coulomb of charge

23
Q

Why do batteries have internal resistance

A

In a battery, chemical energy makes electrons move. As they move, they collide with atoms in the battery which causes resistance

24
Q

Total resistance of a series circuit =

A

R1 + R2 + R3

25
Q

Total resitsance in a parallel circuit =

A

1/R1 + 1/R2 +1/R3

26
Q

What is a potential divider at its simplest

A

Resistors in series with a voltage source which splits the voltage in the ratio of the resistances

27
Q

Energy =

A

charge x voltage

28
Q

Relationship between power, force and velocity

A

Power = force x velocity

A-Level Physics (8 decks)

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