Have a look at our electric bill calculator for more information on that calculation. If you leave that lightbulb on for 10 hours, you will have used one kilowatt-hour of energy.Ĭalculating this can help you understand your electric bill. Say you have a lightbulb that uses 100 W of power per hour. Here’s an example that illustrates kilowatt-hours: It’s important to remember that it’s a unit used to measure power usage, not time. This would be full exposure to sunlight at the brightest time of day.Ī kilowatt-hour, on the other hand, refers to 1,000 watts being used in an hour. If your panel says it produces 250 W, that means it’s capable of producing 250 units of power when it’s in optimal conditions. So how do watts fit into the solar panel picture? Well, since watts measure power, they will give you a quantification of the power produced by your solar panel. If you’re looking for a watt calculator, we have a guide on how to do that as well. The symbol for watt is W, which you’ll see us using in the formula below. The watt is the unit used to measure power, hence the definition “the rate at which energy is consumed.” We have a useful guide on converting watts to amps if that’s what you’re looking for.Įnergy is defined as the capacity to do work, while power is defined as the rate at which work is done. This shouldn’t be confused with amps, which are used to measure current. It’s the amount of energy an item needs to perform its job, and describes the rate at which energy is consumed. But first, we want to ensure you have an understanding of both units, which are used to measure power.Ī Watt is a single unit of power. Sample task: convert 2 Watts of power maintained over an hour to Joules.Converting watts to kilowatt-hours is as simple as using a formula. For example, if your input is in KiloWatt, you need to divide by 1,000 in order to get the result in Joules. Then you need to follow the definition the Watt as 1 Joule per second and perform the mathematical transformation required to convert the time units to seconds and the power unit to Watts. Therefore, in our Joules to Watts converter you have two inputs: one for power (mW, W, KW, MW) and one for time (sec, min, hours). In order to convert Watts - a unit of power, to Joules - a unit of energy, we need to know a third variable - the time period of interest. More energy will be used in a given time-frame with a higher level of power, therefore, for a set energy level, a longer period results in higher energy consumption under the same power, while a higher level of power would spend the available energy in less time. The equivalent energy unit for Joules is Watt hours. Energy is the work performed over a period of time while Power is the rate of delivery of energy, meaning work performed per unit of time. Watts are units of power while Joules are units of energy and there is often confusion about the difference between the terms power and energy. Our Watts to Joules converter also supports conversion from MilliWatts (mW), Watts (W), KiloWatts (KW), and MegaWatts (MW) to KiloJoules (kJ) and MegaJoules (mJ) per second, per minute or per hour. Where E is the energy in Joules, P is the power in Watts, and t is the time in seconds. The formula for calculating Energy in Joules (J) is: In the International System of Units (SI) it is defined as a derived unit of 1 Joule per second with a symbol W. This comes from the definition of the Watt, which is a unit of power used to quantify the rate of energy transfer. Exactly 1 Watt equal one Joule per second.
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