Electrical Unit Review
Ions

An atom that has gained an electron
(more negative) is called a negative ion

An atom that has lost an electron (more
positive) is called a positive ion

Electrons are the only part of the atom
that moves
Electricity

Study of Electricity is called electrostatics

Electricity is the movement of electrons
from one object to another
Two Types of Electricity

Static electricity – electrons do not move
freely, usually stays in one spot

Current electricity – electrons do move
freely, this is found in a circuit
Static Electricity

Insulators – electrons do not move easily
(the charge will stay where it was created)

Conductors – electrons can move freely
over the object
Static Electricity

Electrostatic series table (will be given) –
the object on the top is always positive
the object on the bottom is always
negative
Static Electricity

Three ways of charging an object:
– Charge by friction (rubbing)
– Charge by contact (just by touching)
– Charge by induction (when the object is
brought close but does not touch)
Static Electricity

Two major ways of discharging an object:
– By Grounding
– By discharging at a point
Current Electricity

Parts of a circuit: Know how to draw them
and what they do.
1) Electrical Load - Converts energy
2) Electrical Source - Provides energy
(electricity flows from the
negative to the positive)
3) Electrical Switch - turns on and off the circuit
4) Wire - pathway
Current Electricity

What is Ohms Law
V= IxR
Current Electricity
Name
Unit
Symbol in
Ohm’s Law
Voltage
V
V
Current
A
I
Resistance
Ω
R
Current Electricity

What is Electrical Energy, What is its unit,
what is the equation to find it
1) Electrical energy is the movement of energy
from the electron to the load
2) Joule
3) E = V x I x t (sec)
Current Electricity

What is Power, its unit, what is the equation
1) Power is the rate at which an object uses
energy
2) Watts
3) P = V x I
Current Electricity

You need 5 things per question to get 5
points:
1)
2)
3)
4)
5)
LIST
FORMULA (the one you will use)
SHOW WORK/CORRECT ANSWER
UNITS EVERYWHERE
SENTENCE