# GSCE Science: Physics: Electricity

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• Created by: Anna
• Created on: 15-08-13 11:37
What is meant by 'charging by friction'?
When electrons from one object rub off onto another, creating charges.
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What is meant by 'charging by induction'?
Charging an object by causing electrons to rebel against an already charged object.
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Describe the use of a gold-leaf electroscope
An instrument used to tell whether an object is charged by the movement of a 'gold leaf' towards/away from it.
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Define 'current'
The flow of charge in an electronic circuit.
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Define 'voltage/potential difference'
The amount of elctronical energy that is transfered to an electrical componant per unit of charge.
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Define 'Resistance'
The opposition to the flow of charge.
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Match the key words; current, voltage, resistance and charge, to the units; V, C, A and Ω
Current - A, Voltage - V, Resistance - Ω, Charge - C
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What would be the main cause of resistance found in a copper wire and why?
The copper particles as these obstruct the flow of charge through the wire.
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Name the 4 factors that effect resistance
Temperature, Material, Length and Thickness of the wire.
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What is the equation for calculating charge?
Q = I x T (Charge = Current x Time)
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What is the equation for Ohm's law?
R = V / I (Resistance = Voltage / Current)
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Describe the link between voltage, current and resistance.
The higher the voltage used, the less resistance it gets and therefore the more current it has.
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Describe the relationship between the length of a wire and its resistance.
As the wire increases in length, there are more atoms and electron collisions are more likely to occur. The length of the wire is directly proportional to the resistance.
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What is a fuse?
A thin piece of wire that lets a current of up to a cetain value flow through before the wire overheats and melts.
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## Other cards in this set

### Card 2

#### Front

What is meant by 'charging by induction'?

#### Back

Charging an object by causing electrons to rebel against an already charged object.

### Card 3

#### Front

Describe the use of a gold-leaf electroscope

Define 'current'

### Card 5

#### Front

Define 'voltage/potential difference'