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GCSE 9-1 Physics revision > Electricity > Flashcards

Electricity Flashcards

1
Q

Electric current

A

The electric current is the flow of electric charge around a circuit (Amps)

It moves from the negative end of the cell to the positive end of the cell

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2
Q

Series circuit

A

It has no branches. The current can only flow in one path

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3
Q

Measuring current

A

We can measure the current in a circuit by using an ammeter

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4
Q

Is current used up in a circuit

A

Current is never used up in a circuit

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5
Q

Is the current the same or different all the way round the circuit

A

In a series circuit, the current is the same all the way round the circuit

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6
Q

Conventional energy

A

Scientists always draw the current in the opposite direction

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7
Q

Branches

A

A parallel circuit contains branches

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8
Q

Current in a parallel circuit

A

The current in the branches add up to the total current leaving the cell

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9
Q

Coulombs (C)

A

Electrical charge is measured in C

A current of 1 ampere = 1 coulomb of a charge flowing per second

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10
Q

Name 1 thing that stores chemical energy

A

Battery

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11
Q

Potential difference

A

P.D of 1V tells us that 1J of energy is transferred for each coulomb of charge that is moving through the circuit

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12
Q

P.D in a series circuit

A

P.D is split between components

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13
Q

P.D in parallel circuit

A

For components connected in parallel, the p.d across each component is the same

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14
Q

P.d between batteries

A

2 cells = 1 battery

E.g. 1 cell = 6V
1 battery = 12 V

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15
Q

What is a flow of electrons

A

Electric current

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16
Q

What is the current through a resistor

A

Directly proportional to the potential difference

Ohmic conductor

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17
Q

In dark conditions what is the resistance of an LDR (light dependant resistor)

A

High resistance

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18
Q

In the light what is the resistance of the LDR

A

Very low resistance

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19
Q

How much energy does a circuit need to pass through the LDR

A

Very little energy

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20
Q

Thermistor

A

The resistance of a thermistor decreases if the temp increases

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21
Q

In cool conditions what is the resistance of the thermistor

A

High resistance

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22
Q

How much energy does the current need to pass through the thermistor

A

Lot of energy

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23
Q

What is the p.d across the thermistor

24
Q

What is D.C (direct current)

A

The current from a cell is a d.c

25
What is a A.c (alternating current)
Mains power electricity in the UK is an alternating current The current is constantly changing direction
26
Brown wire
Live wire Carries the alternating potential difference from the supply
27
What is the live wire connected to
To the fuse
28
Blue wire
Neutral wire Completes the circuit P.d=0v compared to the live wire
29
Green/ yellow stripped wire
Earth wire Safety wire to stop the alliance from becoming live
30
Is the live wire dangerous
Extremely dangerous and could easily be fatal if touched They could be electrocuted
31
What does National grid consist of
Transformers | High voltage cables
32
What happened when electricity passes through step up transformer
Increase pd Reduces energy lost in the transmission cables
33
What happens to the energy in the power cables when the pd is very high
Less energy is lost
34
What happens when electricity pass through step down transformer
Reduces pd
35
Electric current
The electric current is the flow of electric charge around a circuit (Amps) It moves from the negative end of the cell to the positive end of the cell
36
Measuring current
We can measure the current in a circuit by using an ammeter
37
Is current used up in a circuit
Current is never used up in a circuit
38
Is the current the same or different all the way round the circuit
In a series circuit, the current is the same all the way round the circuit
39
Current in a parallel circuit
The current in the branches add up to the total current leaving the cell
40
Potential difference
P.D of 1V tells us that 1J of energy is transferred for each coulomb of charge that is moving through the circuit
41
P.d between batteries
2 cells = 1 battery E.g. 1 cell = 6V 1 battery = 12 V
42
What is a flow of electrons
Electric current
43
What is the current through a resistor
Directly proportional to the potential difference | Ohmic conductor
44
In dark conditions what is the resistance of an LDR (light dependant resistor)
High resistance
45
In the light what is the resistance of the LDR
Very low resistance
46
How much energy does a circuit need to pass through the LDR
Very little energy
47
Thermistor
The resistance of a thermistor decreases if the temp increases
48
In cool conditions what is the resistance of the thermistor
High resistance
49
How much energy does the current need to pass through the thermistor
Lot of energy
50
What is the p.d across the thermistor
High
51
What is Power
Power is the rate at which energy is transferred
52
Is the live wire dangerous
Extremely dangerous and could easily be fatal if touched They could be electrocuted
53
What happened when electricity passes through step up transformer
Increase pd Reduces energy lost in the transmission cables
54
What happens to the energy in the power cables when the pd is very high
Less energy is lost
55
What happens when electricity pass through step down transformer
Reduces pd

GCSE 9-1 Physics revision (5 decks)

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