Section 3 Part 1- Physics Flashcards
What is an atom
An atom is the smallest unit in which an element can exist
Static electricity by definition
Is non moving electrical charge always formed by friction “rubbing”
What is an atom composed of?
Protons “positive charge” middle (heavy)
neutrons “no charge” middle (heavy)
and electrons “negative charge” outside circles
The number of protons and electrons are?
Equal
Elements have a positive or negative charges?
They have an even charge
When atoms rub together the electrons
Get rubbed on or off of the atom
Two types of static electricity
Negative: is caused when electrons are rubbed on
Positive: is caused when electrons are rubbed off
Nature of static charge \++ -- -+ -,+- \+,-+
Repulse Repulse Come together Attracted Attracted
Declaring static charge: two ways
Touch: you can feel the charge as you get close
Electroscope: a device used to detect the presence of an electric charge
Uses of static
Sandpaper Swifter Saran Wrap Rubbing sticks together to make fire Matches Photocopiers
Size of static: static is measured in
Coulombs (C) 1c = 6.24 ✖️ 10 to the power of 18 electrons
Current electricity by definition
Moving electrons
In order for electrons to move they need a pathway and a desire to move
Pathways for electrons conductors by definition and different qualities
A material that allows electrons to move freely
Good super but no perfect
Good=coper titanium
Super= good and silver
Metals tend to be good
Note about conductors and current
Conducts must be good enough quality for the current
The purpose of insulators
To prevent electrons
To control current (where electrons move) we always protect conductors with insulators
Good and great insulators
Rubber plastic dry wood fibre glass air glass ceramic
What is the desire for electrons to move
Electrical potential
What are the two ways we can generate electrical potential
Separate opposite charges
Force like charges together
What is to separate opposite charges
Take atoms and pull the electrons and protons in opposite direction from each other
How is electrical potential measured
It is measure in voltage
Storing electrical potential, in?
Stored in batteries or cells
First Batterie was made of carbon and zinc
Series, effects
Has a single pathway for electrons to travel
An overall increase in voltage with the addition of more cells in a series,but the batterie only lasts as if it was only one batterie
Parallel, effects
There are many batteries under each other
The batterie life lasts way longer but it is dimmer
Current is measured in?
Electrical potential is measured in?
Current=Amps what it actually is, current is movement of electrons
Electrical potential=voltage what could be
Because no conductor is perfect the voltage and amps cannot be the same
