![]() ![]() Its definition, in the context of electricity, is the energy of one watt power flowing for one hour.įollowings equivalent equations are identical but in different units.ġ W h = 1 P t = 1 I V t = 3 6 0 0 J = 2. Read more about average electricity consumption and the price of electricity per kilowatt-hour.A watt-hour is a unit of energy and its units, Wh, are formed with W for watt and h for hour from SI unit system. If you use a 15 kilowatt central air system for 2 hours, your consumption amounts to:ġ5 kilowatts x 2 hours = 30 kilowatt-hours (kWh) Remember, there are 1,000 watts in 1 kilowatt.Ĭonsumption per appliance can vary from 60 watts (0.06 kilowatts) for a lightbulb, to 15,000 watts (15 kilowatts) for central air conditioning. Consumption is usually marked on your appliance in watts, so you may have to do some calculation. When you use a 1 kilowatt appliance for 1 hour, you have consumed one kilowatt-hour of electricity. Basically, this is short for "one kilowatt during one hour." When you buy electricity, your energy provider charges you by the kilowatt-hour (kWh). This is the part that matters the most for understanding your electric bill. This is an approximation, for a Power Factor of 40% is rather low for a computer charger, but it is a way for you to calculate your appliance's power in Watts from information in Amperes and Volts. In real life, the power factor is usually in between 30% and 90%. A power factor is a measure of the synchronization of the phases of the Current (in Amperes) and the Voltage (in Volts). A perfect synchronization give the Power Factor a value of 100%, and the lowest synchronization possible gives the Power Factor a value of 0%. Use this power converter to convert instantly between horsepower, kilowatts, megawatts, volt amperes, watts and other metric and imperial power units. One must apply a Power Factor to this AC result in order to obtain the average power in kilowatts. Therefore the requirement for this power cable will be In the US, plugs supply current at around 110V. ![]() The input (electricity coming from the plug) is a little bit more complicated, because it is in AC current (Alternating Current). This is described in the red circle, and also in the bottom rectangle, which describes the output (the electricity going out of the charger and into the computer). Using Calculator Factory, you'll never have to worry. From basic arithmetic to complex mathematical formulas, this calculator is perfect for students, professionals, and anyone who needs a handy tool for their daily routine. This charger will deliver 65W in DC current (Direct Current) to the computer. Calculator Factory is a powerful and free calculator that allows you to efficiently perform a wide range of calculations. The power required by the computer is 65W. This indeed corresponds to the 65 watts indicated in the red circle on the photograph If you multiply these 2 numbers together, you obtain: 19.5V x 3.34A = 65.13 VA ~ 65 W. Here, in the output ( in the wire going out of the charger towards the laptop computer), the Voltage is 19.5V, and the Amperage is 3.34A. In the image below, energy consumption is expressed in both watts (W), volts (V), and amperes (A). 1 kVA equals 1000 VA, and depending on whether you are in AC (alternating current) or DC (direct current), 1 kVA will more or less be equal to 1kW.ġ kVA = 1000 VA 1kVA ~ 1kW Your experience with kVA will probably happen with appliances that express their energy consumption in amps or voltage. Please visit power conversion to convert all power units. W to kW formula kW W 0.001 kW W / 1000 What is Kilowatt Kilowatt is a metric system power unit. To convert watts to kW, multiply the watt value by 0.001 or divide by 1000. Ok, so you've got watts and kilowatts down, but what the heck is a kVA? The kVA (kilovolt-ampere) is just another measure of power. 1 Watt (W) is equal to 0.001 kilowatt (kW). And a modern CFL lightbulb, even less still, like 15 watts. A TV, on the other hand, uses a lot less-around 150 watts. A kilowatt is equal to 1000 watts.įor example, an average microwave consumes approximately 1000 watts, or 1kW. In the case of lightbulbs, knowing how many watts are consumed also tells you how bright the light emitted will be. We bet that when you think of watts, you probably think of lightbulbs! Watts and kilowatts (kW) are both units of measurement for electricity, and are used to talk about how much electricity a system consumes (or produces).
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