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AQA GCSE - Physics > 2.4 Current Electricity > Flashcards

2.4 Current Electricity Flashcards

1
Q

How is static electricity created?

A

When two electrically insulating materials are rubbed together electrons are rubbed off one material and deposited on the other

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2
Q

What happens to the material that gains electrons in static electricity?

A

It becomes negatively charged

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3
Q

What happens to the material that loses electrons in static electricity?

A

It becomes positively charged

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4
Q

What is the process of creating static electricity called?

A

Charging by friction

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5
Q

When two electrically charged objects are brought together what happens?

A

They exert a force on each other

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6
Q

What do two object with the same charge do?

A

Repel each other

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7
Q

What do two objects with opposite charges do?

A

They attract each other

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8
Q

The bigger the distance between electrically charge objects…

A

The weaker the force between them

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9
Q

What does a resistor do?

A

Reduces current flow

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10
Q

What does a variable resistor do?

A

Alter the amount of current continuously depending on the conditions

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11
Q

What does a thermistor do?

A

Changes the current flow as temperature changes

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12
Q

Does a voltmeter go in in series or parallel?

A

Parallel

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13
Q

Does a ammeter go in in series or parallel?

A

Series

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14
Q

What does a light dependent resistor do?

A

Changes the current depending on the light

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15
Q

What does a diode do?

A

Allows current to only flow in one direction

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16
Q

What is current?

A

It is the rate of flow of electrical charge through a current

17
Q

What is the unit of flow of charge?

A

Coulombs

18
Q

What is potential difference?

A

Voltage

The work done for every coulomb of charge flowing through the circuit

Which means the energy carried per electron

19
Q

Current in a series circuit?

A

Same

20
Q

Current in a parallel circuit?

A

Splits

21
Q

Voltage in a parallel circuit?

A

Same

22
Q

Voltage in a series circuit?

A

Splits

23
Q

What is resistance?

A

The opposition to current flow

24
Q

What is resistance measured in?

A

Ohms

25
Q

What is ohms law shown on a graph?

A 
If a resistor is kept at a constant temperature the current-voltage graph is... 
Directly proportional 
Passes through (0,0)
As voltage doubles current doubles
26
Q

What is ohms law in summary?

A

The current through a wire is proportional to the voltage across it provided the temperature remains constant

27
Q

What is a component called that obeys ohms law?

A

An ohmic conductor

28
Q

How do you work out the total resistance in a series circuit?

A

R1+R2+R3…. etc

Just add them

29
Q

How do you work out the total resistance in a parallel circuit?

A

1/TR = 1/R1 + 1/R2 + 1/R3 … etc

30
Q

What happens to the resistance in a filament bulb as a result of temperature?

A

Resistance increases as the temperature increases

31
Q

Why does the temperature increase in a bulb with more current/voltage

A

The more energy there is for friction giving off heat

32
Q

Because a diode only flows in one direction what is the resistance like in the other direction?

A

Very high

33
Q

What does a diode need before current is produced?

A

A certain amount of voltage is needed before a current is produced

On a graph the line doesn’t start at the origin

But as voltage increases so does current

34
Q

In a thermistor what will low temperature do to the resistance?

A

High resistance

35
Q

In a thermistor what will a high temperature do to the resistance?

A

Low resistance

36
Q

How does resistance link to light in an LDR?

A

Resistance decreases as light intensity increases

AQA GCSE - Physics (16 decks)

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