8.8 ENERGY
·
The Six Types of Energy and the Units used
Ø
Work: (W) energy expended by exertion of a force.
Ø
Potential Engery: (PE) a form of work done by moving a weight.
Ø
Kinetic Energy: (KE) a form of energy possessed by an object in
motion.
Ø
Thermal Energy: (Q) or heat, is energy associated with a change in
temperature.
8.9
POWER
·
Power
Ø
Power is defined as energy per time.
Ø
Power = energy / time
Ø
W = J / s
Ø
SI unit of power is watt
Ø
Power is the rate at which energy is delivered over time.
8.11 ELECTRICAL CONCEPTS
·
Electric Concepts (electric charge, electric current, voltage,
electric resistance, electric power)
Ø
Electric Charge: Physical property of matter that causes it to
experience a force when placed in an electromagnetic field. There are two types
of electric charges: positive and negative.
Ø
Electric Current: measured in aperes. A flow of electric charge.
Ø
Voltage: is quantified using units of volts, and is an
electromotive force of potential difference expressed in volts.
(amasci.com/miscon/voltage.html) Voltage is what pushes the charges around to
create current.
Ø
Electric Resistance: Repulsion of a current within a circuit.
Resistance is quantified using ohms. One ohm is defined as one volt per ampere.
Ø
Electric Power: The rate at which electric energy is transferred
by an electric circuit. The SI unit of power is watt. (One joule per second)
·
Discuss resistors
Ø
A device having a designed resistance to the passage of an
electric current.
Ø
They act to reduce current flow and act to lower voltage levels
within circuits.
·
Discuss capacitors
Ø
A device used to store an electric charge,
consisting of one or more pairs of conductors separated by an insulator.
Ø
Like a battery.
Ø
Store electrical energy.
·
Discuss Inductors
Ø A passive two-terminal
electrical component which resists changes in electric current passing through
it.
Ø Stores energy in the
form of a magnetic field.
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