The following table gives “real-world” examples of the quantities of energy and power represented by metric units (Joules and Watts) modified by metric prefixes.
|Modifier||Primary Energy examples||Power examples|
|Name||Value||Unit||Example, energy sufficient to||Unit||Example, about the power of:|
|Exa.Joule||Australia’s annual crude oil consumption = 1.5 Exa.Joules.
Australia’s annual coal consumption = 1.75 Exa.Joules.
Solar energy falling on Australia in two minutes = 1 Exa.Joule
|P||peta||1015||PetaJoule||Australia’s annual natural gas consumption = 800 Peta.Joules.||PetaWatt||peak solar power falling on Australia is over 8 PetaWatts|
|T||tera||1012||TeraJoule||medium factory gas use in one year.||TeraWatt||peak solar power falling on all Australian buildings
(ie 20 times electrical requirements)
|100 GJ||An average car will use about 50 GJ of fuel per year.||100 GW||peak solar power falling on Australian home roofs is about 400 GW
the total Australian maximum electrical demand is around 50 GW.
|10 GJ||gas consumption of efficient home (10-30 GJ) in one year||10 GW||peak electrical demand of NSW|
|G||Giga||109||GigaJoule||solar energy falling on a Hobart home roof in one day in Winter.||GigaWatt||medium-large power station.
total peak output of Australia’s domestic solar water heaters.
|100 MJ||coal used to supply average home with electricity for one day.||100 MW||small power station / large cogeneration plant|
|10 MJ||a ten minute shower||10 MW||largest factories|
|M||Mega||106||Mega.Joule||run a large TV or a PC for one hour||1 MegaWatt||largest city building, medium hospital, medium-large factory.|
|100 kJ||make a cup of tea with a gas kettle. primary energy to charge transistor battery.||100 kW||electricity for medium office building. peak solar power on same building|
|10 kJ||10 kW||large electric water heater, peak demand of medium-large home.|
|k||kilo||103||kiloJoule||1 kiloWatt||domestic heater or air-conditioner. The peak solar energy falling on 1m² of the earth. /p>|
|<||100||100 Joule||100 Watts||desktop computer, incandescent light, person standing.|
|10||10 Joule||10 Watts||notebook computer, VCR,|
|–||–||(=1)||Joule||1 Watt||transistor radio (~5 W).|