Ch.20 - Current and Charge

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9 Terms

1
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3 effects of an electric current

  • heating effect - electricity heats things up

  • magnetic effects causes magnetism

  • chemical effect - bubbles of gas


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electric current

flow of electric charge through a circuit

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circuit

the path around which the charge flows

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conductor

a substance through which electric charge can flow

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insulator

a substance through which electric charge cannot flow

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SI unit of electric charge

the coulomb (C)

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Electric current

the size of an electric current in a conductor is the amount of charge passing any point of that conductor per second

  • symbol: I

  • SI unit: the ampere (A)

  • I = q/t aka steady current = charge that passes a point / time taken (s)


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conventional current

is said to flow from + to -

in a metal, electrons flow from - to +

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whenever the direction of electric current is mentioned…

always means conventional current unless stated otherwise