# Electricity

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```							Electricity

Chapter 19 & 20
Current Electricity
Circuit- A continuous conducting path
Electric Current- The net amount of charge passing thru
a circuit at a point in a unit of time
- I = the symbol for current
- amperes – amp (A) – the unit for current
- 1 ampere is 1 coulomb per second

I = q/t
Current Movement

Conventional Current
- current moves from positive to negative

Electron flow current
- current moves from negative to positive

* Same info
Electrical Potential

-Pressure of Flow                - voltage
-Potential difference            - electromotive force
-1 volt is the electrical potential difference between two
points if it takes 1 joule of work per coulomb to move a
positive charge from 1 point to another

V = W/q                 E = VIt
E = qV                  q = It
Resistance
-opposition to electron flow or to movement of current
-The unit of resistance is the ohm ()
-Factors affecting resistance
-Area of cross section of the conductor
-Length
-Temperature
-Material
Ohm’s Law
-the amount of current is proportional to the
potential difference applied to the ends of
the wire and is inversely proportional to the
resistance of the wire

V = IR
Power

-rate at which a load (resistor) uses energy
-Energy transformed per unit of time

P = VI              P = I2R
P = V2/R
Units =
Watt
Kilowatt hours (E = Pt)

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