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Basic Electrical CircuitsAdvanced Design ApplicationsMr. Brooks
What is electricity? The movement of electrons through an
electrical circuit.
Electrons Atom has three parts
Proton Neutron Electron
Key terms Current: The flow of electrons through a
circuit. The amp is the unit of electrical flow.
Voltage: The electromotive force that pushes electrons through a circuit. The volt is the unit of electromotive force.
Resistance: The opposition to the flow of electrons. The ohm is the unit for the resistance to electrical flow.
Where does electricity come from? Three main sources:
Occurs naturally Direct current (Batteries) Alternating Current(Generators)
Electricity in nature Lightning Solar storms Electric eels Polar auroras
Direct Current Direct current is a unidirectional flow of
electric current. Electricity flows at a constant, steady rate.
Examples of power sources that use AC are: Batteries Solar Cells
Alternating Current Alternating Current is a flow of
electricity that is not constant. In fact the direction of current flow periodically switches direction.
Examples of AC are: Generators Home power outlets
Generator A generator uses magnetsMagnets to push electrons through a circuit,much like a pumppushes water through a pipe.
Breadboard A breadboard is a prototyping device
that allows the user to create/experiment with electrical circuits.
Resistors We will now construct the “resistor”
circuit in our electronics labs and answer the following questions in your notes.
What does a resistor do? How does it work? What devices use resistors?
Diodes We will do the “diode” circuit in our
electronics labs. What is a diode? How does it work? What devices do you thinkUse diodes?
LED We will do the “LED” lab in our
electronics lab kits. What is an LED? How does it work? What devices use LEDs?
Capacitor We will do the “capacitor” activity in our
electronics lab kits. What is a capacitor? How does it work? What are some devices that use capacitors?
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