Electric Current Electric current The net movement of electric charges in a single direction through a wire or conductor Voltage difference The force that causes electric charges to flow charges flow from high voltage to low voltage ID: 639441
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Slide1
What property of electric current allowed Edison’s first light bulb to light?Slide2
Electric Current
Electric current
– The net movement of electric charges in a single direction through a wire or conductor.
Voltage difference
– The force that causes electric charges to flow; charges flow from high voltage to low voltage.Slide3
Circuit
– A closed path that electric current follows
Circuits include a power source (battery), wires, and some resistor (light bulb) and a voltage difference allows current to flow.Slide4
Batteries
Dry Cell
Chemical reactions occur in a moist paste causing the transfer of electrons
Ex. AA or D battery
Wet Cell
Contains two connected plates made of different metals in conducting solution.
Ex.
Car batterySlide5
Resistance
– The tendency for a material to oppose the flow of electrons, changing electrical energy into thermal and/or light energy.
Ex. Light bulb, dial, switch, heating coil
Making wires thinner, longer, or hotter increases resistance.Slide6
All materials have some electrical resistance measured in
ohms
(
Ω).
Ohm’s Law
– current in a circuit equals voltage difference divided by the resistance.
Current (I) =
voltage difference (V)
resistance (R )
Current
measured in
amps (A)
,
voltage
difference measured in
volts (V)
,
resistance
measured in
ohms (
Ω
)