# Electricity part one - Q&A

• Created by: Cat91
• Created on: 17-06-18 07:44
What does the current in a circuit depend on?
Resistance and potential difference.
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Potential difference =
Current x resistance. (V=IR)
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What is P.D measured in?
Volts (V)
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What is current measured in?
Amperes (A)
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What is resistance measured in?
Ohms
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What is current a measure of?
The rate of flow.
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What happens if there's a larger current?
A faster rate of flow.
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Which elements of a circuit resist current?
All of them.
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What is a variable resistor?
A resistance that can be changed.
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What is a fixed resistor?
A resistance that stays the same.
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What is a resistor?
Something designed to reduce the current.
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What are resistors used for?
To control the current in electric circuits.
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What is resistance a measure of?
The amount of opposition to the current.
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Who discovered the connection between current, voltage and resistance and when was it made?
Georg Ohm in 1827.
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What is V=IR known as?
Ohms Law
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If the p.d increases, what also increases?
The current.
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What are the p.d and the current?
Directly proportional.
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What are the current and the resistance?
Inversely proportional.
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Name some factors that affect the resistance of a wire.
Material, thickness, length and temp.
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How does the length of a wire affect it's resistance?
The longer the wire, the higher the resistance.
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What causes resistance?
Electrons colliding with metal ions.
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What does thickness have to do with resistance?
The thicker the wire the larger the surface area the less of a chance of collision.
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What are the two different types of circuit?
Series and parallel.
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What happens when there's multiple resistors in parallel?
The total resistance of the circuit is reduced.
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What happens when there's multiple resistors in series?
The total resistance of the circuit is increased.
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## Other cards in this set

### Card 2

#### Front

Potential difference =

#### Back

Current x resistance. (V=IR)

### Card 3

#### Front

What is P.D measured in?

### Card 4

#### Front

What is current measured in?

### Card 5

#### Front

What is resistance measured in?