Energy vs. Power?. POWER Power= the rate at which energy is used measured in watts (joules/sec)

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Presentation transcript:

Energy vs. Power?

POWER Power= the rate at which energy is used measured in watts (joules/sec)

1000W= 1 KW 1,000,000 W = 1 MW Average human food 2500 kcal/day U.S. Average Home... Average power` Residential PV Rooftop system (typical) Tesla Roadster Google’s PV System Big Wind Turbine Industrial Cogeneration plant (e.g. SU) Large Coal Plant Nuclear power plant California’s Peak Power Demand Total U.S. Generating Capacity Total U.S. Primary Energy (95Quads/yr) Total Global Primary Energy 100 W t = 0.1 kW t 1.3 kW 3 kW 185 kW 1600 kW = 1.6 MW 5 MW 50 MW 600 MW 1000 MW = 1 Gigawatt 50 GW 1000 GW = 1 Terrawatt 3.2 TW 15 TW

Energy Energy= Quantity, or amount, of work that is actually done. Measured in watt-hours, kilowatt- hours and mega-watt hours Power (kW) = Energy(kWhr) / Time (hr) Energy (kWhr) = Power (kW) * Time (hr)

If the average home has an average power of 1.3 kW, how much Energy does is use in one year?

Energy = Power x Time

If the average home has an average power of 1.3 kW, how much Energy does is use in one year? Energy = Power x Time = 1.3kW x 365 days x 24 hours 1 day

If the average home has an average power of 1.3 kW, how much Energy does is use in one year? Energy = Power x Time = 1.3kW x 365 days x 24 hours 1 day

If the average home has an average power of 1.3 kW, how much Energy does is use? Energy = Power x Time = 1.3kW x 365 days x 24 hours 1 day = 11,388 kWh

If the average home has an average power of 1.3 kW, how much Energy does is use? Energy = Power x Time = 1.3kW x 365 days x 24 hours 1 day = 11,388 kWh x 1MWh 1000kWh

If the average home has an average power of 1.3 kW, how much Energy does is use in one year? Energy = Power x Time = 1.3kW x 365 days x 24 hours 1 day = 11,388 kWh x 1MWh 1000kWh = MWh

If lil’ B’s house used 20 MWh of electricity over one year, what is the average power of his house? Power = Energy / Time

If lil’ B’s house used 20 MWh of electricity over one year, what is the average power of his house? Power = Energy / Time

If lil’ B’s house used 20 MWh of electricity over one year, what is the average power of his house? Power = Energy / Time = 20 MWh X 1000 KWh 1 MWh =

If lil’ B’s house used 20 MWh of electricity over one year, what is the average power of his house? Power = Energy / Time = 20 MWh X 1000 KWh 1 MWh = 20,000 Kwh

If lil’ B’s house used 20 MWh of electricity over one year, what is the average power of his house? Power = Energy / Time = 20 MWh X 1000 KWh 1 MWh = 20,000 Kwh 8,760 h/yr = 2.28 Kw

How many houses could one 5MW wind turbine power? # Houses/turbine = 5 MW/turbine 1.3 KW/house

How many houses could one 5MW wind turbine power? # Houses/turbine = 5 MW/turbine.0013 KW/house =3,946 houses