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Electricity Grade 9
Grade 9 science review
Question | Answer |
---|---|
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 |