# Resistance.

• Created by: cieran_10
• Created on: 24-06-18 20:06
How are ammeters connected to a circuit?
In series.
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What are the units for current?
Amperes (A.)
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How are voltmeters connected to a circuit?
In parallel.
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What are the units of p.d.?
Volts (V.)
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What is resistance?
The opposition to current flow.
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What do current-p.d. graphs show?
To show how the current of a component varies with the p.d. across it.
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What does a resistor's p.d.-current graph look like? What is this given that?
A straight line through the origin. Given that the resistor is at a constant temperature.
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What is Ohm's law?
The current-p.d. graph for a resistor.
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What is ohmic conductor?
Something that behaves in the same way as a resistor on a current-p.d. graph.
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What does Ohm's law only apply to?
A resistor at a constant temperature.
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At a constant temperature what happens to a component's resistacne, ragrdless of the direction of its current and p.d.?
It remains constant.
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Complete the rule: the greater the resistance of the resistor, the less steep the...
Current-p.d. graph.
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## Other cards in this set

### Card 2

#### Front

What are the units for current?

Amperes (A.)

### Card 3

#### Front

How are voltmeters connected to a circuit?

#### Back ### Card 4

#### Front

What are the units of p.d.?

#### Back ### Card 5

#### Front

What is resistance?

#### Back 