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So What Is Electricity, Really?

Electronics 1, Week 1

Kyle Evans

on 2 October 2018

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Transcript of So What Is Electricity, Really?

So What Is Electricity, Really?
Ancient History
Baghdad batteries
Over 2000 years old!
First discovered in the 1930s
Created in ancient Persia (Iraq)
Effects of electric fish first documented by ancient Egyptians
Ancient Greek and Roman physicians began noting the numbing effects of shocks from the fish and used them to cure headaches
Electric Fish
Static Electricity
600 BC: Static electricity is first observed by Thales of Miletus, a Greek Philosopher
Rubbed an amber rod with cat hair
Thought the result was magnetism, but he was wrong!
Electricity: A History
"Modern" History
William Gilbert
Ben Franklin - 1706
Michael Faraday - 1791
Thomas Eddison - 1847
Nikola Tesla - 1856
Famous Modern Inventors
Ewald Georg von Kleist
Leyden Jar (early battery) invented in 1745
Further experiments and studies made famous by Ben Franklen
1600 AD - Present
Again observes the effects of static electricity with amber rod
Coins the term
(Latin for "of amber")
What Are Atoms Made Of?
Protons (Positive Charge)
Electrons (Negative Charge)
Neutrons (Neutral Charge)
All matter is made up of different combinations
of these three particles.
118 known elements exist (Periodic Table)
Atomic Structure
Protons and Neutrons
Orbiting negatively charged particles
Balanced Charges
Atom in Normal State:
Same number of protons as electrons
Helium Atom
2 Proton + 2 Electron = No Charge
Valence Electrons
Valence Electron:
Orbits furthest from the nucleus
Highest energy
Less tightly bound to the atom
Electron Shells:
Groups of orbiting electrons
Ions and Free Electrons
When a valence electron absorbs sufficient energy, it escapes from the atoms orbit and becomes a:
Free Electron
When an atom is left with an uneven charge it is called an:
Positive Ion:
More protons than electrons
Negative Ion:
More electrons than protons
Electrical Charge
Electrostatic Force
Charges of the same type repel each other, while charges of opposite types are attracted together.
Voltage, Current and Resistance: The Big Three
The measurement of the difference in potential energy between charges
Measured in Volts (V)
Alessandro Giuseppe Antonio Anastasio Volta
Voltage is the driving force in electric circuits
Voltage Source
Provides electrical energy (Voltage)
by means of chemical energy, magnetic energy or light energy
The measurement of the movement of free electrons from negative to positive ends of a material
Measured in Amperes or Amps (A)
André-Marie Ampère
The property of a material that resists the flow of electrons
Measured in Ohms (Ω)
Georg Simon Ohm
Resistor: Component designed to have a specific amount of resistance
Schismatic drawing of a resistor
Electrical Circuit and Schematics
Electric Current
A continuous flow of electrons through a material
3 Types of Materials
From 2750 BC
Full transcript