# Physics - Electricity

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What becomes electrically charged when they are rubbed together?
Insulating materials.
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When charges are the same, materials what?
Repel
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When charges are different, materials what?
Attract
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How do the two different insulating materials become charged by rubbing together?
Electrons move from one material to the other
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Do both materials have the same charge, if not, why?
No, the material that loses an electron becomes positively charged, the material that gains an electron becomes negatively charged.
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They are opposite but what do they both have?
Equal amount of charge.
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What two circuits can components be connected in?
Series and parallel.
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What two things are important for a circuit to work?
Must be a complete circuit (atleast battery and lamp) and no shoet circuits (way past the lamp without going through another component.
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In a series circuit how are the components connected?
On after another on the same loop.
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In a parallel circuit how are the components connected?
On separate loops, parallel to each other.
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In a series circuit, the current that flows through each component is the same, what about in the parallel circuit?
The current is shared between each component..
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What is the electric current?
The flow of electrical charge
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What is current measured in and how?
Amps using an ammeter in parallel with the component been measuerd.
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How is resistance measured and how?
In ohms, calculated from the potential difference across a component and the current flowing through it.
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What is the total resistance?
The total sum of the resistances of the all components in a circuit.
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What two things increases the resistance?
When the length of the wire increases and when the thickness of the wire decreases.
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Why do the two/three wires in a mains electricity cable have a core of copper?
It is a good conductor of electricity.
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Name the three wires and their colour?
Neutral - blue, live - brown, earth - green and yellow stripes.
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Which two wires does electricity usually only come out of?
Neutral and live wire.
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What is the earth wire for?
Protection and safet.
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How do fuses protect electrical circuits and appliances?
Fuse has a low melting point so when current going through the fuse is too great, the wire heats up and melts which breaks the circuit.
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Electrical suplies can be direct current or what?
Alternating current.
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When is the electricity supply direct current?
If the current flows in only one direction
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When is the electricity supply alteranting current?
If the current constantly changes direction.
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What is electricity in homes?
Alternating current.
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Many electrical appliances have metal casing so why is it important they have and earth wire?
It is safe route rather than the live wire which if it came loose and touched the metal casing it would give people and electric shock.
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## Other cards in this set

### Card 2

#### Front

When charges are the same, materials what?

Repel

### Card 3

#### Front

When charges are different, materials what?

### Card 4

#### Front

How do the two different insulating materials become charged by rubbing together?

### Card 5

#### Front

Do both materials have the same charge, if not, why?