Physics Revision

Electricity and circuits

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Static Electricity
When insulating materials are rubbed together, negatively charged electrons will be scraped off one and dumped on the other. This will leave a positive static charge on one and a negative static charge on the other
1 of 17
Explain how opposite charges attract each other
When two electrically charged objects are brought close together, they exert a force on one another. If these charges are opposite, they will attract. If they are the same, they will repel
2 of 17
Define current and what its unit is
The flow of electric charge round a circuit. Unit: ampere, A
3 of 17
Define potential difference and what its unit it
The driving force that pushes the current round. Unit: voltage, V
4 of 17
What is the function of an ammeter?
Measures the current in amps (A). Must be placed in series and can be put anywhere in series in the main circuit, but never parallel to the voltmeter
5 of 17
What is the function of a voltmeter?
Measures the potential difference in volts (V). Must be placed in parallel around the component
6 of 17
Current only flows in................. through a diode
one direction
7 of 17
Why are LED's (light emitting diodes) useful?
They use a smaller current and than other forms of lighting
8 of 17
The resistance of a .............. decreases as temperature increases
thermistor
9 of 17
What is AC and what does it do?
Alternating current. It means that the current is constantly changing direction
10 of 17
What is DC and what does it do?
Direct current. It means that the current always keeps flowing in the same direction
11 of 17
Why are some cables called three-core cables?
Because they have three wires
12 of 17
What are the names of the three wires that are composed within a cable?
Live wire, neutral wire and earth wire
13 of 17
Why is the earth wire called an earth wire and what is the colour of the wire?
The earth wire is green and yellow and it carries electricity to the earth
14 of 17
What is the colour of the live wire?
Brown
15 of 17
What is the colour of the neutral wire?
Blue
16 of 17
Earthing and fuses prevent..........
Electrical overloads
17 of 17

Other cards in this set

Card 2

Front

When two electrically charged objects are brought close together, they exert a force on one another. If these charges are opposite, they will attract. If they are the same, they will repel

Back

Explain how opposite charges attract each other

Card 3

Front

The flow of electric charge round a circuit. Unit: ampere, A

Back

Preview of the back of card 3

Card 4

Front

The driving force that pushes the current round. Unit: voltage, V

Back

Preview of the back of card 4

Card 5

Front

Measures the current in amps (A). Must be placed in series and can be put anywhere in series in the main circuit, but never parallel to the voltmeter

Back

Preview of the back of card 5
View more cards

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