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Science 9 Unit 3 - Electricity - Coggle Diagram
Science 9 Unit 3 - Electricity
Topic 1
Static Electricity
Not moving
build up of electrons or transfer of electrons
Opposites attract, Like charges repel
Charge separation
Electrical discharge
Current Electricity
electrons flow
conductors = allow electrons to flow
insulators
Circuits
load (light bulb), battery (source), wire (conductor)
Safety
Lightning Rod
Resistors
Fuses (break the line - melt) and Breakers (flip - switch)
Topic 4
Sources of Energy
Tides
Water (falling)
Heat (fossil fuels, biomass, geothermal energy - energy from center of earth)
Solar
Wind
Topic 2
Switches and Resistors
Conductors and Insulators
conductor - lets electrons flow - not tightly bound to the nucleus
insulator - electrons held tight to nucleus
Ohms Law
I = amps (current)
V = volts (voltage)
r = resistance (ohms)
V= I x R
Series vs Parallel Circuits
Series - only one path for electrons to follow
Parallel circuit - more than one pathway for electrons
Topic 3
Chemical Energy
Energy stored in chemical bonds
Mechanical Energy
Movement
Thermal Energy
Heat
Electrical Energy
Charged particles
Transformations
Human body: Chemical to thermal and mechanical
Toasters: electrical to chemical
Motors
Armature (spinning center)
Brushes
Magnets
Commutator (split ring)
Generators
spinning a coil of wire in a magnetic field
Power
P (power) = watts
I (current) = amps
V (voltage) = volts
P = I x V
Efficiency
Eff. = output/input x 100
Energy
E = P x t
Energy in Joules. Time (s), Power (W)
Energy in kwh. Time (h), P (kW)