Presentation on theme: "Basics of Electricity. What is Electricity? Involves the movement of electrons Is invisible Provides light, heat, sound, motion... Has been practical."— Presentation transcript:
What is Electricity? Involves the movement of electrons Is invisible Provides light, heat, sound, motion... Has been practical for use over the last 100 years
History 2500 years ago, the Greeks rubbed amber with other materials. They discovered that this process would attract feathers and other lightweight materials to the amber.
History Ben Franklin suggested that......opposite charges attract and like charges repel. + -
History Ben Franklin suggested that......opposite charges attract and like charges repel. + + The Law of Charges explains why the electrons continue to be bonded to the nucleus.
Electron Flow An electron from one atom can knock out an electron from another atom.
Electron Flow Electricity is created as electrons collide and transfer from atom to atom. Play Animation
What Makes Up Electricity? Let’s compare it to something we know --- Water!
Water Analogy Tank = Battery Pipe = Wiring Faucet = Switch Tank Faucet Pipe
Current Current: The flow of electric charge When the faucet (switch) is off, is there any flow (current)? NO When the faucet (switch) is on, is there any flow (current)? YES Tank (Battery) Faucet (Switch) Pipe (Wiring)
Current in a Circuit When the switch is off, there is no current. When the switch is on, there is current. off on off on
Voltage Voltage: The force (pressure) behind the flow of current When the faucet (switch) is off, is there any pressure (voltage)? YES – Pressure (voltage) is pushing against the pipe, tank, and the faucet. When the faucet (switch) is on, is there any pressure (voltage)? YES – Pressure (voltage) pushes flow (current) through the system. Tank (Battery) Faucet (Switch) Pipe (Wiring)
Voltage in a Circuit The battery provides voltage that will push current through the bulb when the switch is on. off on off on
Resistance Resistance: The opposition to the flow of current. What happens to the flow (current) if a rock gets lodged in the pipe? Flow (current) decreases. Tank (Battery) Faucet (Switch) Pipe (Wiring)
Resistance in a Circuit Resistors are components that limit the flow of electricity. Reducing current causes the bulb to become more dim. off on Resistor
Types of Electricity (You might already know these!)
Types of Electricity Static Electricity The electrical charge an object develops as a result of having an unequal number of protons and electrons. Current Electricity The movement of electrons through a conductor.
Static Electricity Uncontrollable Electricity Lightening Static Cling Wool socks on a carpet “shocks”
Current Electricity Two Types: Alternating Current (AC) Direct Current (DC)
Direct Current The electrons flow in the same direction all the time, from negative to positive. -+
Direct Current Comes from Batteries Converted from Alternating Current Used for electronic devices including Computers iPods Cell phones Anything that has a “charger”
Alternating Current The electrical current (movement of electrons) changes direction.
Alternating Current Comes from Generators Coal burning and nuclear power plants Hydroelectric power plants Wind and solar generators Used for Motors Heaters Lights Anything that plugs into the wall
Image Resources Microsoft, Inc. (2008). Clip Art. Retrieved September 10, 2008, from http://office.microsoft.com/en-us/clipart/default.aspx