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# Electrical Current

An introduction to Electricity
by

## Rodney Pierson

on 15 April 2011

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#### Transcript of Electrical Current

Electrical Currents What is Electrical Current? Definition
-- The rate at which charges pass a given point
Units of measurement
-- Amperes
-- Shortened to Amps 2 Types of Current
DC
-- AKA: direct current
-- Electrons always flow in the same direction.
-- Batteries in a camera or a flashlight use DC
AC
-- AKA: alternating current
-- The electrons can move in either direction
-- Electrical outlets in your home use this. Voltage Definition
-- The measure of how much work is needed to move a charge between 2 points.
Units of measurement
-- Volts (V) Resistance Definition
The opposition to the flow of electric charge
Like “electrical friction”
Units of Measurement
Ohm’s
Represented by the Greek letter omega Variables which affect resistance Material
Good conductors have a:
-- Low resistance
-- Like Copper
Insulators have a:
-- High resistance
Temperature
As you increase a metals temperature
You increase resistance
Superconductors
-- Metals at very low temperature who’s resistance is virtually zero Electrical “Cells” Electrical "Cells"

Definition:
These change chemical or radiant energy into electrical energy
Parts
Electrolytes
-- Mixture of chemicals which allow charges to flow
Electrodes
-- Points at which charges enter and leave the cell. 2 Types
Dry Cell
-- Electrolytes are solid or paste
-- Normal batteries
Wet Cell
-- Electrolytes are liquid
-- Car batteries Electrical Calculations Ohm’s Law
--Relates current, voltage, and resistance
-- Voltage = Current X Resistance
-- V = I X R
Electrical Power
-- Power = Voltage X Current
-- P = V X I
-- Measured in Watts
Full transcript