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# Electricity Grade 9

### Grade 9 science review

what is Electrical force? total charge of an object depends on the difference in protons and electrons
What is an electrical force field? All charged objects give off one.
What is conduction? The movement of electrons
If an object is lower on the electrostatic scale that means what? it gains electrons and becomes negative
If an object is higher on the electrostatic scale that means what? it loses electrons and become positive
a neutral object is charged how? By being rubbed with another neutral object
A conductor is? Allows electrons to flow through easily
An insulator is? Tightly bonds electrons. So there is no movement
Electrical current is? The speed at which charge flows
electrical resistance is? How much an object resists the flow of electrons
Thicker means? Less resistance
Longer means? More resistance
Warmer means? More resistance
Induction charged separation is? electrical fields push or pull electrons
induction is? charging without contact
Strength of electrical force depends on: 1. # of electrons 2. Space between the electrons
AC/ Alternating current is? current flowing back and forth
DC/ Direct current is? current flowing in 1 direction
PVI? P=Watts V=Volts I=Amps
EPT? E=Joules P=Watts T=Seconds
Electrical potential difference is? The amount of energy needed to move a charged particle
KWH= Watts divided by 1000 x Hours used
electricity cost= Usage x Cost of electricity
Efficiency of electricity= Energy out divided by energy in x 100%
A circuit is? A loop of electrical current from one power source to another through loads
Parallel circuit? Many loads in between
Series circuit? Only 1 load
Parallel A= V= A=# divided by how many power sources V=Stays the same
Series A= V= A=Stays the same V=# divided by how many power sources
Primary Cell is? Not re-chargeable
Secondary cell is? Re-Chargeable
Created by: pinkcheer