Introduction to Electrostatics
What are the 2 types of charge something can have?
Positive, negative
What is a current?
The flow of charge from one place to another.
How do you draw the triangle for Ohm's Law formula?
V
I R
The device that converts electric current into a form of usable energy is the:
Load
What are the 2 parts of Coulomb's law of electric force?
Force of attraction is directly proportional to charge strength.
Force of attraction is inversely proportional to the distance between charges.
Define grounding.
Grounding is the process of "getting rid of" any unwanted electrical charge into the earth.
Current electricity is divided into 2 types, depending on how it flow:
Materials through which electric currents flow easily are called ____, whereas materials that do not allow easy current flow are ____.
The lines of force of an electric field always represent a ____ charge.
Positive
What are the 2 methods that charge can be transferred?
Conduction and induction
What are the units of voltage, current, and resistance?
V, a, Ω
A closed circuit means there is connection between source-load-source. An open circuit means there is not.
Define electrostatics
The study of the nature, behavior, and uses of static electricity.
"The total charge is the same before and after any electric interaction" is the definition of:
Law of Conservation of Charge
How is a thunderstorm a good example of both static and current electricity?
The thundercloud is static (- in the sky, + on the ground), but the lightning is current.
Ohm's law states that current and voltage are _____ related, and current and resistance are ____ related.
Directly, inversely
What does the law of electric charges say?
Opposite charges attract; like charges repel.
Charging by _______ is usually temporary, whereas charging by _______ is usually permanent.
Induction, conduction
Please explain voltage, current, resistance with an example.
Answers vary
Voltage = pressure in a hose
Current = diameter of hose
Resistance = sand in the hose
What 3 components does a circuit need?
1. source of current (battery)
2. conductors (wires) to carry the charge
3. a load to use the energy