# electricity

what is charge?
charge comes in two general types:positive and negative.when two objects have the type of charge they guve a repulsion when they are close together. when two objects have different charges then they attract to eachother when they are close together.
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what is current?
current is the flow of electrical charge. a current flows when electrons move through a conductor such as a metal. is is measured with an ammeter and its units are amps(A)
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what is potential difference?
potential difference is often called voltage o electromotive force. it is measured with a voltmeter and its units anre volts(V). the voltmeter only works when it is paralell to the component.
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what is resistance?
resistance is the opposition in an electrical component to the movement of electrical charge through it. it is measured in ohms.
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what are the colours of the wires in a plug, what are their namesand where are they in a plug?
earth wire-green and yellow-middle live wire-brown-right. nuetral wire- blue-left
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what is ohms law?
the current in a circuit between the points a and b is directly proportional to the voltage betweenpoints a and b and inversely proportional to the resistance between the points.
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what is diect current?
when current only flows in one direction.
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what is alternating current?
when the constantly changes direction.
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## Other cards in this set

### Card 2

#### Front

current is the flow of electrical charge. a current flows when electrons move through a conductor such as a metal. is is measured with an ammeter and its units are amps(A)

what is current?

### Card 3

#### Front

potential difference is often called voltage o electromotive force. it is measured with a voltmeter and its units anre volts(V). the voltmeter only works when it is paralell to the component.

### Card 4

#### Front

resistance is the opposition in an electrical component to the movement of electrical charge through it. it is measured in ohms.

### Card 5

#### Front

earth wire-green and yellow-middle live wire-brown-right. nuetral wire- blue-left