10.9: electric current. electric current electric current is the flow of electrons it is a measure...
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Think of it in terms of a waterfall. If you could count the number of water molecules that drop over the edge every second, you could get the rate at which water is flowing past a particular point. Now think of the water molecules as electrons in a wire running past a particular point in a specific amount of time and you have the concept of current. Electric CurrentTRANSCRIPT
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10.9: Electric Current
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Electric Current• Electric Current is the flow of electrons• it is a measure of the rate of electron flow past a given point
in a circuit• measured in amperes (A)
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• Think of it in terms of a waterfall. If you could count the number of water molecules that drop over the edge every second, you could get the rate at which water is flowing past a particular point.
• Now think of the water molecules as electrons in a wire running past a particular point in a specific amount of time and you have the concept of current.
Electric Current
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Electric Current
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• Direct Current (DC)• flows in only one direction (electrons from a battery)
• Alternating Current (AC)• flows back and forth at regular intervals (comes from generators and carried to your home through power lines)
Electric Current – two types
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DC Direct Current
AC Alternating Current
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Current can KILL !
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Measuring Current• Current in a circuit is measured using an ammeter. • The unit of electric current is the ampere (A). • An ampere is a measure of the amount of charge
moving past a point in the circuit every second.
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Measuring Current• A current of 1 ampere means that 6.2 x 1018
electrons pass a particular point every second.
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Ammeter• There are two terminals on the ammeter• The negative (–) terminal is often black, • The positive (+) terminal is often red.
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Ammeter• Always connect the positive terminal of the meter closest
to the positive terminal of the electrical source (battery). • Connect the negative terminal of the meter closest to the
negative terminal of the electrical source.
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Measuring Current Activity• Fill in the following table as you follow the steps
below
Connection of Ammeter Electric Current (A)Between light bulb and switch
Between battery and light bulb
Between battery and switch
Construct a circuit using a battery, light bulb, switch, and wires Connect the ammeter between the light bulb and switch Close the switch and note the current in the table Repeat the previous three steps after changing the position of the
ammeter, as described in the table
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Follow-up• Does the current reading change if the ammeter is
moved to a different position in the circuit?
• No!• As long as the switch is closed, the current
should be consistent throughout the circuit.
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Homework• Read pg. 314 - 315• Answer # 1 – 6 on pg. 315