One heater uses 340 W of power when connected by itself to a battery. Another heater uses 244 W of power when?

One heater uses 340 W of power when connected by itself to a battery. Another heater uses 244 W of power when connected by itself to the same battery. How much total power do the heaters use when they are both connected in series across the battery?
tried 584, isn't right.

P = E²/R
R = E²/P

R1 = E²/340
R2 = E²/244

in series, add them
Rt = E²/340 + E²/244

P = E²/R = E²/(E²/340 + E²/244)
E's cancel
P = 1/(1/340 + 1/244) = 142 watts

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Geysers or Water Heaters

Remember all those water heater disasters that made you take cold showers on freezing winter mornings. This is why you should be considerate while buying a water heater rather than just picking the one pushed by sales person. Choosing a water heater mainly depends upon the factors like the size of your family, the utilities in your area and the space available for your water heater.

Other than the above considerations it also something that highly relates to your electricity bills in winters. Heating water typically consumes from 15 to 25 percent of a home's total monthly energy budget. This is the reason new age water heaters focus on water heating effectiveness making them more energy efficient. Thus If you are in the market for a new water heater, make sure to check the energy rating.

The initial step to choose a geyser is deciding the capacity. To decide on the capacity, one needs to take into account the hot water requirement into consideration. It also depends on the application, usage / bathing pattern and number of users. Storage water heaters, tank less on-demand water heaters, and instant hot-water dispensers are the types of heaters you can select from.

Storage water heaters are the most commonly used familiar tall, cylindrical white tanks. Natural gas, electricity, propane, or fuel oil are the fuels used by these heaters. Electric water heaters are the one mostly used these days. The tank can store from 20 to 80 gallons of water. On the average, water heaters last for 13 years, hence an energy efficient one can save you a lot in terms of energy bills. To check the efficiency looks for the first hour rating (FHR) number. This indicates how much hot water the heater can supply Per Hour at peak usage. The minimum FHR to select for your home will depend upon the number of bathrooms and bedrooms it has. Another label on the water heater should reveal its energy factor (EF). This indicates how well the unit converts its fuel to heat. The higher the EF number, the more efficiently the water heater uses its energy. Although electric units may use their fuel more efficiently, electricity is a much more expensive water-heating fuel than gas.

Tank less or on-demand water heaters heat water directly, instead of storing it first, as it passes through a series of coils in the unit. Because of the fact that they heat the water directly a tank less heaters are usually more energy efficient than a traditional storage tank water heater. They are available in electric, LP and natural gas models. Hot water dispensers are handy point of use Water Heaters. They are great for making soups, sauces, oatmeal and other instant foods. These units provide 190° water instantly, so be careful when using them.

About the Author

Vinnit Alex is a well known author and has written articles on Geysers, Kitchen Appliances store, Heaters, online shop and many other subjects.

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