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Grade 9 - Unit 4 –Electrical Principles & Technologies Concepts
STATIC Electricity
CURRENT Electricity
Charge Separation
Electrical Discharge
Continuous flow of electrons through
conductors.
Laws of
Electric
Charges
Electrical Circuit
conductor - energy source - load
Electrical SAFETY
Short Circuits
Insulators
Plugs (Ground)
Fuses
Breakers
Safety Regulations
Power Grid
VanDeGraff
Generator
VOLTS
Potential Difference
Voltage Drop
Safety Rules
AMPERES
Current flow rate
Galvanometers
OHMS Ω
Resisting the flow
Multimeter
Ohm’s Law R = V / I
Voltmeter
Source – Load – Conductor - Switch
CELLS
Electrical Circuit Symbols
CIRCUITS
2 different Electrodes
in an Electrolyte
Series
(Only 1 Path)
WET Cell
Electrolyte is
a liquid
Parallel
(Multiple Paths)
Conductors – Insulators
Superconductors
Types of Resistors
Wire-bound
Carbon composite
Variable Resistors
Rheostat (varies resistance)
Varistor (temperature change)
Thermistor (surge protector)
DRY Cell
Electrolyte
chemicals in
a paste
Microcircuits
Transistors – act as switches
2 cells make a BATTERY
Battery Types
Primary – Secondary
Electrochemistry
Electrolysis – Electroplating
Galvanizing – Electro-refining
Energy E = P x t
Law of Conservation of Energy
Energy
TRANSFORMATIONS
Energy
TRANSFORMATIONS
Chemical
Electrical
Mechanical
Thermal
Light
Sound
Generators
Motors ( DC – AC )
Energy can neither be created nor
destroyed, it can only be transformed from
one form to another
EFFICIENCY
St. Louis Motor
Transformers
Energy SOURCES
Fossil Fuels – Light (Solar)
Geothermal – Gravity – Tides Wind – Biomass– Fuel Cells
Energy (output) x 100
Energy (input)
IMPACTS
Renewable vs Non-Renewable Energy
Air Pollution
Conservation of Energy
Sustainability