FutureStarr

A W Calculator

## A W Calculator # W Calculator

With our watt calculator, you'll have a better understanding of what is Watt's law and the electrical power unit. Would you like to learn how to find watts? What about what connects volts, amps, watts, and ohms? Well, to do that, we need to dive in and discover what the power equation is!

### Calculate

Meant to be used in both the teaching and research laboratory, this calculator (see below) can be utilized to perform a number of different calculations for preparing percent (%) solutions when starting with the solid or liquid material. It is very common to express the concentration of solutions in terms of percentages. Percent means per 100 parts, where for solutions, part refers to a measure of mass (μg, mg, g, kg, etc.) or volume (μL, mL, L, etc.). In percent solutions, the amount (weight or volume) of a solute is expressed as a percentage of the total solution weight or volume. Percent solutions can take the form of weight/volume % (wt/vol % or w/v %), weight/weight % (wt/wt % or w/w %), or volume/volume % (vol/vol % or v/v %). In each case, the percentage concentration is calculated as the fraction of the weight or volume of the solute related to the total weight or volume of the solution.

Each calculator cell shown below corresponds to a term in the formula presented above. Enter appropriate values in all cells except the one you wish to calculate. Therefore, at least two cells must have values, and no more than one cell may be blank. The value of the blank cell will be calculated based on the other values entered. After a calculation is performed, the calculated cell will be highlighted and subsequent calculations will calculate the value of the highlighted cell (with no requirement to have a blank cell). However, a blank cell has priority over a highlighted cell. (Source: www.physiologyweb.com)

### Use

Most utility companies calculate your electricity bill based on how many kilowatt-hours, or units of energy you use each month. Since the scientific unit of energy is measured in joules, you will often see your energy usage listed in joules on your electric bill. Remember, one joule is equal to one watt. If you can convert watts to kWh, you can predict how much it might cost to run your various electrical appliances and devices.

Kilowatt-peak (kWp) refers to the rate a system can generate energy during its peak performance, which is when it’s working at its maximum capacity. We most commonly use kWp for solar electricity systems. These systems are labeled with a rating in kilowatts peak (kWp) so that consumers can compare the output capabilities and size of various photovoltaic panels. (Source: justenergy.com)

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