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Physics Paper 1 > Electricity > Flashcards

Electricity Flashcards

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1
Q

What is an LDR

A

dependent on light intensity in bright light resistance falls and at night resistance is higher

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2
Q

What is a thermistor

A

Temperature dependent reisitor if it’s hot then resistance is less if cold resistance increases

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3
Q

Explain what happens in a series circuit

A

If one component breaks all the components stop working

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4
Q

How do u work out potential difference in series circuit

A

Total potential difference is shared ( add them together

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5
Q

How to work out current in series circuit

A

It is equal to ammeter

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6
Q

How to work out reisistance in series circuit

A

Add up to make total resistance

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7
Q

What happens in a parralell circuit

A

If one component stops working it will not affect the others

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8
Q

Potential difference in parallel circuit

A

Equal

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9
Q

Current in parallel circuit

A

Total of all currents (added up

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10
Q

Resistance in parallel circuit

A

Adding resistance reduces total resistance

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11
Q

What is the blue, green and red wire

A

Blue. Neutral
Green earth
Red live

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12
Q

What does live wire do

A

Provides potential difference

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13
Q

What does neutral wire do

A

Completes circuit

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14
Q

What does earth wire do

A

Protection
Stops appliance coming live and Carries current if there’s a fault

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15
Q

What is the national grid

A

System of cables and transformers
Transfer electrical power from power stations to meet demands

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16
Q

What does step up transformer do

A

Increase voltage as electricity flows through cables

17
Q

What does step down transformer do

A

Decrease potential difference to make it safe

18
Q

Independent depended and control variable for resistance of wire

A

Length of wire
Resistance
Type of metal, diameter of wire

19
Q

Independent depended and control variable of series and parallel circuits with resistor

A

Circuit type
Resistance
Number of resisters, type of power source

20
Q

Independent depended and control variable relationships in circuits

A

Potential difference
Current
Number of components

21
Q

How do you investigate relationships in circuits

A

Set up circuits and measure the current and potential difference
Draw graphs once collected

22
Q

What is charge

A

Current flowing past a point in given time

23
Q

What is a ohmic conductor graph like

A

Current is directly proportional to potential difference
Straight line

24
Q

What is the filament lamp graph like

A

As current increase so does temp
Makes it harder for current to flow so graph is less steep

25
Q

What is diode lamp like

A

Current only flows in one direction
Resistance is very high in other direction meaning no current can flow

Physics Paper 1 (3 decks)

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