History of Electricity
How did the ancient Greeks learn about electricity?
Rubbing fossilized amber could cause it to hold a charge and attract small objects.
This is often compared to "water pressure", and is determined by the battery.
Voltage
A material that does not allow the flow of electricity is called what?
Insulator
Every magnet has two what?
Poles. A positive and negative end.
A closed path that electricity can follow.
Circuit.
This famous experiment proposed by Benjamin Franklin, proved that lightning was a form of electricity. What was the experiment?
The famous kite experiment, showing that electric charge could move from the sky to the ground.
The number of electrons flowing through an area is called what?
Current
Where do electrons move when you rub your feet on the carpet?
Electrons move into your feet.
Cutting a magnet in half creates what?
Two more magnets.
This is burned to create steam, which turns turbines an generates electricity.
Fossil Fuels (Coal, Oil and Gas)
This scientist invented the first battery. The "Volt" is named after him.
Alessandro Volta
This is measured in Ohms.
Resistance
Give an example of a dangerous type of static electricity.
Lightning.
Why does a compass point north?
The tiny magnet in a compass is attracted to Earths Magnetic field, causing it to point north.
How can you decrease current in a circuit?
Increase resistance, or decrease voltage.
This famous inventor developed the first practical lightbulb to be used in homes. He became very rich.
Thomas Edison
What does Ohms law state?
Voltage is equal to current multiplied by resistance.
V = I x R
Do like charges repel or attract?
Repel.
Electricity and Magnetism are similar because they are both ________.
Non contact forces.
The invisible area of force around a magnet is called what?
Magnetic field.
This famous inventor improved the use of AC (Alternating current), which our entire modern electrical system runs off of. He died poor, using all of his money to continue conducting different experiments using electricity.
Nikola Tesla
A hair dyer is plugged into a circuit with .5 amps, and the circuit has a resistance of 12 ohms. What is the voltage?
6 Volts
How can a charged object lose its charge?
By touching another object and transferring electrons.
What does the Earths magnetic field protect us from?
Radiation from the Sun. (Solar Flares)
True or false. Some animals can detect magnetic fields.
True.