400 watts how much

How much per year? Exercise 3. Assume your window AC uses watts. How much does it cost to run it continuously for a month? It's not for any period of time, because watts is a rate at that instant. One might as well ask:. It's not for any period of time. You're going 35 miles an hour at that instant. So, just multiply the watts times the hours used to get the watt-hours.

Then divide by to get the kilowatt-hours, which is how your utility charges you. The average U. The U. Wikipedia has a list of electricity rates around the world. Despite the whining from some American consumers, the U. California has a ridiculously complicated way of figuring its tiers. First you have to find your "baseline quantity" different for every area, and for winter vs. For example, an all-electric no gas San Francisco household has baseline quantities of In a day month, the baseline is Feel free to let me know when that actually goes into effect.

Here are the average rates for each state Table 5. You really want to know your rate from your utility, and even then you should look for the rate you're paying in your highest tier, since that's the rate you'll save at through your conservation efforts. Some utility companies impose an additional charge based on the maximum amount of electricity you draw at any one time.

This is called a demand charge. The chart at right from Wisconsin Electric illustrates the concept. The shaded area is how much electricity you used, and you know you get charged for that. But the black bar on top is the demand, how much energy you "demanded" at any given point throughout the day.

If your utility company has a demand charge ask them , then you can save money by spreading out your electrical use throughout the day. Running appliances one after the other rather than at the same time would reduce your demand. And better yet, running them when you're not using much electricity for other purposes such as at night when the air conditioner is off will reduce your demand even more.

Some utilities have cheaper rates in the evenings. Check with them to find out. That's because it's harder for them to reach peak demand during the day when everyone's running the AC.

So they might charge less in the evenings to try to get you to move some of your consumption like laundry machines outside of those daytime hours. Most utilities in the U. And even when a utility is a traditional business, they're often regulated and can't just promote electric consumption willy-nilly. To find the price for the kWh used, multiplying by the cost per kWh charged by the electric company by the kilowatt-hours measurement found above.

This cost is shown on the monthly electric bill from the power company. For example, find the electricity cost per month to run a computer with a w power supply that is running 4 hours per day. Use our lighting cost estimator to find out how much lamps and light bulbs cost to keep on for the month and to find out how much money can be saved by upgrading to LED light bulbs. Our voltage drop calculator can calculate a drop in voltage, minimum wire size, and maximum wire length for your electrical project.

You are here. Daily Usage:. Amps calculation with line to neutral voltage. To find x, simply divide by , which is 2. So watts at volts is approximately 2. Asked by: Keith Otazua home and garden home entertaining How many amps is watts? Last Updated: 22nd May, Power Current Voltage Watts 3. Dobrinka Professional. How many amps is watts at volts? Dewayne Melkheier Professional. What is meant by 1 ampere? An ampere is a unit of measure of the rate of electron flow or current in an electrical conductor.

One ampere of current represents one coulomb of electrical charge 6. The ampere is named after Andre Marie Ampere , French physicist Yeriel Beosin Professional. How many watts is an amp hour? Amp - Hours to Watts Conversion. Singh Nervion Explainer. How many amps does watts draw? Cesarina Fustel Explainer. How many watts is an amp? Power Current Voltage 50 Watts 0. Terezinha Whittingham Explainer. Watts and amps conversion charts.