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Basics of Electricity
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The action of electricity flowing
in a conductor is called . "current flow".
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The symbol for current is the
capital letter "IIII".
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Figure 1.4. Can compare water flow to electron flow.
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A flow meter can be used to measure
the quantity of water flowing in a pipe. See
Figure 1.5 Water flow is measured in litres per second.
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Current flow through a conductor is
measured in amperes and is symbolised by, a capital letter "A" .
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An ammeter can be used to measure
current flow in a conductor.
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Figure 1.5. Current flow measured in amperes (Amps).
A pump can be used to cause water to flow in a pipe. See
Figure 1.6. The force that makes the water flow is called pressure. Water pressure
is measured in Pascal (Newton per sq. metre). A battery or electrical generator can be used to
cause current to flow in a conductor. The generator, for example, acts as an electrical" pump
making the electrons flow through the conductor, through the light bulb, and back to the generator.
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This results in an electrical
"pressure" called electrical potential or voltage, which is symbolised by capital letter
"E".
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Electrical potential (E) is
measured in volts (V) with a voltmeter.
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