Explain the difference between a Kilowatt and a Kilowatt-Hour?

Question

In Scientific Terms, Please

Answer 1

Kilowatt (kW): A standard unit of electrical power equal to 1000 watts. The term “kilowatt” (in addition to the measurements of “watt” and “megawatt”) is commonly used to describe the capacity of an electric generator, particularly in reference to small solar photovoltaic and other generating systems.

Kilowatt-hour (kWh): 1,000 watts or 1 kilowatt acting over a period of 1 hour. One kilowatt-hour is equal to 1,000 watt-hours and is equal to 3600 kJ. The primary difference between a kilowatt and a kilowatt-hour is that “kilowatt” measures the capacity of an electric generator and “kilowatt-hour” measures the actual amount of electricity it produces over a certain period of time.

Answer 2

A kilowatt is a unit for power, a kilowatt-hour is a unit for the transfer of electrical energy (since Energy = Power x Time)
1 kWhour = 3600kJ

Answer 3

1 kilowatt is equal to 1000 watt but 1 kilowatt - hour is equal to 1000 watt in 1 hour.
Kilowatt is the unit of power but kilowatt -hour is the unit of energy.

Answer 4

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RE:
Explain the difference between a Kilowatt and a Kilowatt-Hour?
In Scientific Terms, Please

Answer 5

The kilowatt-hour (symbolized kWh) is a unit of energy equivalent to one kilowatt (1 kW) of power expended for one hour (1 h) of time. The kilowatt-hour is not a standard unit in any formal system, but it is commonly used in electrical applications.

Answer 6

The “Kilowatt” denotes “Power;” something like the horsepower of a car’s engine.
The “Kilowatt-Hour” denotes the measurement of Kilowatts used within one hour!

Hope this helps

Answer 7

Watts are the product of Voltage and Current (amperage) Watts= Volts X Amps Volts are the potential for electromotive force. Amps are the measurement of electrons flowing. Amps do the work Volts define the amount of room the electrons have to flow between If you had a 100 watt car amplifier you know that a car uses a 12 volt battery therefore it utilizes 8.3 amps. But if you had a home amplifier with 100 watts and it used a 50 volt potential you would use 2 amps. Even though they are both 100 watts the the car unit uses more amps therefore it would would have a more powerful force to drive the speakers than the home unit. Amps are the component in electricity that can kill you. you could hold on to a live wire with 1000 volts as long as the amperage was only a few milliamps.

Answer 8

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Re your third post, yes, it would cost a lot to power a whole household from solar cells. The fundamental limit as to the power available from solar cells is the amount of energy from the sun, which at midday directly overhead is only about 100 watts per square meter. You can only get that a few hours per day even if you motorize the panels to tilt-follow the sun. Then you must multiply that value by the efficiency of the panels, which for good ones is only about 25%, dropping power out to no more than 25 watts per square meter. In a few hours, you must collect enough energy and store it in say batteries to supply for the rest of the time. Let's say you are very energy conscious, do not use electricity as your source of heat (gas water heater, gas air heating, gas cooking and clothes dryer, etc), and never use air conditioning. You might use say 5 kilowatt-hours of energy per day. Let's also say you always have 12 hours per day of bright sunlight every day, that you are in the tropics where the sun does pass through the zenith twice a year, that the stationary panels are optimally positioned to be perpendicular to incoming sunlight at noon, and ignore the significant atmospheric energy losses occuring during early-to-mid-morning and mid-to-late afternoon. These are all ideal conditions, impossible to reach. Trigonometry can be used to determine that the effective average output from the panels will be 0.637 of the peak. So each day, one square meter of panels will collect about 12hr * 25W * 0.637 =~190 watt-hours 5000 watt-hours divided by that number is about 26 square meters of solar panels. Triple that number to account for less than ideal conditions such as occasional cloudy skies, difference in sun's angle throughout the year, atmospheric energy losses at low sun angles, losses in battery charging, and losses in the inverter used to convert the battery DC voltage to a household AC one. At 78 square meters, I think we're up around $100,000 at that point.

Answer 9

Difference Between Kw And Kwh