![]() Now the system size (kW) never changes, it is always a 10 kW system on this particular roof, but as solar radiation varies from year to year and the equipment ages, the production or kWh will vary each year due to many variables. If it is built facing directly south at an optimum angle to the sun in Colorado I can calculate that in one year that system will produce 14,333 kWh of electricity. So now if you buy a 10 kW sized solar system (about 25 solar PV panels) it is also called a 10,000 watt system or also called a 10 kW system (just move the decimal point left 3 spaces when adding the kilo).x 10) or converted to kilo (meaning 1000) it used 1 kWh. Now if that same light is on for 10 hours the bulb will use 1000 watt/ hrs.If a household light bulb is rated at 100 watts, which describes the power it draws instantaneously when turned on, and you leave that 100- watt bulb on for one hour it will have consumed 100 watts continuously for an hour or as it is called, 100 watt/hr.To help make more sense of this, let me use the light bulb as an example: I dont know how much good it really does to know that number. Thats an average of the power consumed by every square meter of your house over 56 days. KWh is what a specific sized photovoltaic system will produce over a given amount of time. Divide 5.62 kW by 300 square meters and you come up with 18 watts per square meter. Both concepts are referenced when talking about a photovoltaic solar system and important to understand before buying a solar PV system.Ī kW measure power, it represents the actual electrical size of an electrical component, and a kWh measures production of an electrical component such as a photovoltaic system or consumption of a component such as a light bulbs when on. Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences.The difference between a kilowatt (kW) and kilowatt-hour (kWh) is the most misunderstood topic while trying to understanding electricity and how we measure power and consumption/production. ![]() Formula: watts kilowatt hours × 1000 ÷ hours Abbreviated: W kWh × 1000 ÷ hrs Calculator: Kilowatt Hours to Watts Calculator Example Lets say your power bill says you consumed 18 kWh on a particular day. Power and energy really are quite different ideas and it is great that you are getting it straight! To convert kilowatt hours to watts, multiply kilowatt hours times 1000 then divide by hours. If you multiply that by time, you get the total distance travelled or the total energy consumed. ![]() A vehicle can go a particular speed and a bulb can burn at a certain power. If it helps, think about power like speed and energy like distance. If you run it for any period of time, it uses up energy (watt-hours, or kilowatt-hours if it is a particularly powerful bulb). Thus, energy is power times time (E = Pt)Ī bulb is rated for a particular power (60 watts). Watts are a power unit, Watt-hours (literally, this is watts times hours) are an energy unit. (60 watt-hours) / (1 hour) means the "hour" units cancel and you have 60 watts. kilowatthour (kWh) 1.0E+03 Watthour: megawatthour (mWh) 1.0E+06 Watthour: gigawatthour (gWh) 1.0E+09 Watthour: terawatthour (tWh) 1.0E+12 Watthour: Last updated: June 28, 2022, with most recent data available at the time of update. I know that the 0.6 is correct, and I am sure that my solution is incorrect because the units do not cancel with kilowatt hours remaining as the unit in the answer.Ħ0 watt-hours of electricity in one hour means 60 watt-hours per hour or 60 watt-hours/hour. The correct answer is 0.6 kilowatt-hours not 0.6 kilowatts. = (600 watt-hours) / (1 hour) divided by (1000 watts) / (1 kilowatt) This equals 0.6 kilowatt hours.ġ0 hours X (60 watts) / (1 hour) = (600 watt-hours) / (1hour) If the bulb burns for 10 hours, it will use 600 watt hours of electricity. Here is my solution, but it is not totally correct. ![]() I want to know how the different units cancel from the calculation. Is this the same as (60 watt-hours) / (1 hour) or (60 watts) / (1 hour) or neither?Ģ. It means that the bulb uses 60 watt-hours of electricity in one hour."ġ. The information in my textbook indicates the following: "An electric light bulb, for example, may be marked "60 WATT." This number is called the rating of the bulb. If you want to know how many kilowatt-hours (kWh) of electricity the devices uses in an hour, or a day. Find the kilowatt-hours of electricity used by a light bulb with a rating of 60 watts if the light is used for 10 hours. It will display how many watts the device uses.
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