electricity

					                        Do Now
Label a sheet of loose leaf paper with your name and period
then answer the following questions in COMPLETE
SENTENCES.

1.What is a Schematic Drawing?
2.What are the three component that are required to
  have a complete circuit?
3.What is the component that isn't required for a
  complete circuit but is required for any circuit we
  make in this class?
4.What part of the rocket engine creates the Venturi
  Effect which gives the engine additional thrust?
5.What part of the rocket connects the nose cone to the
  airframe?
Electricity
Electricity is produced when negatively
charged electrons are set free from their
confined orbits around the nucleus of an
atom. Once free they are caused to “flow”
from one point to another through a
substance known as a conductor.
Insulators restrict the free movement of
electrons.
Six Sources of electricity
• Friction
• Pressure
• Heat
• Light
• Magnetism
• Chemical action
       FRICTION


1. Friction: Static electricity can be created by
rubbing off electrons of atoms. This happens in
nature when two air masses rub against each other.
Rubbing your shoes across a carpet can build up a
static charge that is released when you touch a
grounded object.
2. Pressure: Certain crystals such as quartz will
produce electric charges when squeezed or struck.
This is called the Piezo effect. Piezo effect is used
to light barbecues and stoves, run watches, digital
scales, and to play records as well as many other
uses.
3. Heat – thermo-electric, dissimilar
metals are heated and electric current
is produced. A thermocouple is used in
an oven as a safety device so gas is
not released until it can be lit safely.
They can also be used as part of a
temperature regulation system.
Sun- photovoltaic panel (solar cell)

 4. Light- Photo-voltaic – Sunlight or
 any light contains photons which are
 small packets of energy. Using a
 photo-voltaic cell, light can be
 converted into electricity. Solar cells
 turn sunlight into electricity directly
 which is very efficient.
5. Chemical – Batteries are the most
common use for chemical production of
electricity. By separating two different
metals with a chemical conductor
(electrolyte) an electrical flow can be
produced. Fuel cell uses a chemical
reaction between hydrogen and oxygen
to produce electricity.
6. Magnetism – When a wire is passed
through a magnetic field, a small amount of
electron flow is produced. The faster the wire
passes through the field the greater the flow.
The more wire and magnets you have the
greater the flow. A generator is a mechanical
devise that moves the wire through the
magnetic field to produce electricity. Most of
the electricity produced today is by
generators.
What about nuclear, wind, hydroelectric?
They are used as an
energy source by a
generator.
Voltage current flow
• How do you measure electricity?
Voltage
• The push behind the electrons.
amperage
• The number of electrons flowing.
• Small amperage small shock
• Large amperage like from outlets,
  deadly shock
Watts
watts = voltage x amperage
Circuits
• A pathway for electrons.
• Series & Parallel Circuits
Complete Circuit Requirements

 • Source
 • Path
 • Load

 • Switch
Series - One complete loop, if one
component fails, the entire circuit fails
Parallel - more than one loop, if a component in
one loop fails, the other loop(s) continue.

				
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posted:8/25/2012
language:English
pages:20