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Energy and SustainabilitySL E-101
DC Electricity 101
Basic Electrical Energy
Voltage = volts = pressureAmps = current = flowPower = Volts x Amps = Watts=Joules/secEnergy = Power x Time = Watt-hours
Electricity
Electricity is an energy carrier – it can be thought of as a flow of electrons in a wire although it can take many forms
Water Analogy
Volts(pressure)
Amps(flow)
Electricity: Energy and Power
Power: Rate of energy production or consumption Watt (joule/second) Volts x Amps (pressure x flow)
Energy: Total amount produced or consumed JoulesWatt-hoursPower x time
Electricity: Power
Power: Watt (joule/second)Kilowatt = 1000 watts Volts x amps
A watt is a pretty small unit - it takes 1000 of them to run your toaster. A kilowatt is 1000 watts.
Volts
Amps
Electricity: Energy
Energy: Watt-hours (joules)Kilowatt-hour= 1 kw for 1 hour Volts x amps x time
Volts
Amps
A watt-hour is a pretty small unit - it takes 50 of them to make your toast. A kilowatt-hour is 1000 watt-hours. A typical utility-connected family uses about 1000 kilowatt-hours per month of electrical energy.
Electricity: Conversions
One watt-hour = 3.41 btu
One kilowatt-hour = 3410 btu
Solar electric design example
Electrical Drawing Symbols
Capacitance in farads
Inductance in henrys
Resistance in Ohms
Voltage Source
Current Source
Ohm’s Law
V=Voltage = VoltageR=resistance = ohms I = Current = amps
V=IRV/I = RV/R=I
Power and Energy in Electric Circuits
Power = VI = watts1000 watts = 1 kilowatt
Energy = power x time
Series and Parallel
Is Futile
House wiring diagram
Electrical Circuits
Reading Electrical Circuit Diagrams