# Electricity

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• Created by: Aabir
• Created on: 29-03-16 10:38
Live wire
Brown wire which alternates between a high positive and negative voltage of about 230V
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Neutral wire
Blue wire which is always at 0V
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Earth wire
Yellow and green wire which carries the current to the earth if there is a fault
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Fuse
A fuse melts and cuts off the circuit if there is a surge in the current due to a fault. The fuse rating should be just higher than the normal operating current.
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Circuit breaker
Similar to fuses, circuit breakers cut off a circuit if there is a surge in current. They work faster, are more convenient and are more effective than fuses.
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Resistor
Resistors get hot when an electric current passes through them. The heating effect increases the resistance, so less current will flow.
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Current
The rate of flow of charge around the circuit. Unit: Ampere
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Voltage
The driving force that pushes the current around. Unit: Volt
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Resistance
Anything in the circuit which slow the flow down. Unit: Ohm
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Alternating current
When the current constantly changes direction.
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Direct current
When the current keeps flowing in the same direction.
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Series circuit
When different components are connected in a line. For example, fairy lights.
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Parallel circuit
When each component is separately connected to the positive and negative of the supply. For example, household electrics.
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Ammeter
Measures the current in a circuit. Always connected in series.
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Voltmeter
Measures the voltage across a component. Always connected in parallel to the component being tested.
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Conductor
Materials that conduct charge easily so a current can flow through them. Usually metals, e.g. copper and silver.
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Insulator
Materials which don't conduct charge very well, so a current can't flow through them. Examples include plastic and rubber.
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## Other cards in this set

### Card 2

#### Front

Blue wire which is always at 0V

Neutral wire

### Card 3

#### Front

Yellow and green wire which carries the current to the earth if there is a fault

### Card 4

#### Front

A fuse melts and cuts off the circuit if there is a surge in the current due to a fault. The fuse rating should be just higher than the normal operating current.

### Card 5

#### Front

Similar to fuses, circuit breakers cut off a circuit if there is a surge in current. They work faster, are more convenient and are more effective than fuses.