Physics: 2.3 - Currents in electrical circuits

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  • Created by: shcoool
  • Created on: 26-05-15 16:48
What is an electric current?
a flow of charge
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What is the size of the current?
The rate of flow of electric charge - I=Q/t
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What is potential difference? (voltage)
It is the work done (energy transferred) per coulomb of charge between 2 points in an electric circuit - V=W/Q
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How can the resistance of a component be found?
By measuring the current through, and potential difference across the component
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The current through a resistor at a constant temperature...
... is directly proportional to the potential difference across the resistor
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How do you calculate current?
I=V/R
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What does the current though a component depend on?
its resistance
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The greater the resistance...
... the smaller the current for a given potential difference across a component
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The voltage provided by cells connected in series is...
... the sum of the potential difference of each cell
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In series what is the resistance?
the total resistance is the sum of the resistance of each component
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What is the current in series?
the current is the same through each component
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What is the voltage throughout a series circuit?
the total potential difference of the supply is shared between the components
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Other cards in this set

Card 2

Front

What is the size of the current?

Back

The rate of flow of electric charge - I=Q/t

Card 3

Front

What is potential difference? (voltage)

Back

Preview of the front of card 3

Card 4

Front

How can the resistance of a component be found?

Back

Preview of the front of card 4

Card 5

Front

The current through a resistor at a constant temperature...

Back

Preview of the front of card 5
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