Elementary Electrical Flashcards
How many valence electrons does a “conductor” have?
Three or Less.
How many valence electrons does a “Insulator” have?
Five or more.
How many valence electrons does a “Semiconductor” have?
Four.
What is “Current”?
Current is the flow of electrons.
What is “Voltage”?
Voltage is the potential difference between two points in an electrical circuit.
What is “Resistance” and what is it measured in?
The measure of opposition to current flow.
Ohms.
What is “Conventional current flow”?
Current flowing out of the positive terminal and returning through the negative.
What is “Electron flow”?
Electrons flowing out through the negative and returning through the poositive.
Do electrons have a positive charge or negative charge?
Negative.
Do Protons have a positive charge or negative charge?
Positive.
In a neutral atom are the protons and neutrons equal or not?
true or false
True.
What makes up the formation of an atom?
Protons and neutrons make up the centre of the atom referred to as the nucleus and the electrons orbit around the atom in “Shells”.
List the best five best Conductors in order.
Silver, copper, gold, aluminium and platinum.
How many valence electrons does copper have?
One.
What is a Semiconductor?
What is an example and how is it used?
A Semiconductor is a material with 4 valence electrons, it is neither a good conductor or insulator but under the right conditions can be both.
Silicon, silicon is mixed with other materials to create micro electronic devices such as transistors.
How does DC current flow?
What are examples of DC current?
DC current is a form of current that flows in one direction unlike AC current.
Most commonly batteries and cells but generators can also produce DC current.
How does AC current flow?
How many cycles occur in one second in Australia? Hertz.
AC current flows in one direction and then reverses and flows in the other direction.
These cycles occur 50 times every second this is measured in Hertz or Hz.
