Commercial unit of electrical energy

The kilowatt-hour (symbolized k W h) is a unit of energy equivalent to one kilowatt ( 1 k W) 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. k W h is the unit of electrical energy, it is same for both commercial as well as domestic. Commercial unit is having different rate of charge and it is more than domestic unit rate . It is basically applied on power consumption in factories or other business sectors.

The unit of electric power is watt, and hence unit of electrical energy is watt – second since energy is the product of power and time. The watt – seconds is referred as joules. One joule means the work required to be done for transferring one-ampere Joule which equals to one watt – second is a very small unit of energy, and it is very difficult to measure a practically consumed electrical energy by this unit. Commercial Unit of Electrical Energy To resolve this problem of measuring practically consumed unit of electrical energy comes into the picture. The commercial unit of electrical energy is a bigger unit of electrical energy. This is watt-hour. Another bigger unit of electrical energy is kilowatt-hours or kWh. This equals to 1000 X one watt-hour. Relation between Unit of Electrical Energy and Unit of Mechanical Energy The basic definition of a unit of mechanical energy is the amount of work to be done to move a body one meter with a force of one newton. This unit of mechanical energy is joule. Again one joule of Relation between Unit of Electrical Energy and Unit of Heat Energy Heat is another form of energy which is wildly used in engineering. The unit of heat energy is calorie, British thermal unit and centigrade heat unit. One calorie of heat energy is the amount of heat required to raise the temperature of one gram water to one degree centigrade. Practically calorie is a very small unit of heat that is why we often use kilocalorie instead. One kilocalorie is the a...

Unit of Power and Problem Solving Using Formula of Power Suppose an old man takes 10 minutes to do a particular “work” whereas a young man takes only 5 minutes to do the same work. It is obvious that the “rate of doing work” of the young man is more than that of the old man. The rate of doing work is known as power, so we can say that the power of young man is more than that of the old man. Thus, power is defined as the rate of doing work. We can obtain power by dividing the ‘Work done’ by ‘Time taken’ for doing the work. That is, Power = \(\frac\) So, Energy consumed = 0.06 kW × 50 h = 3 kWh Thus, the electrical energy consumed is 3 kWh or 3 units. Example Problem 2. A family uses 250 units of electrical energy during a month. Calculate this electrical energy in joules. Solution: 250 units of electrical energy means 250 kWh of electrical energy. Now, we know that: 1 kWh of energy = 3.6 × 10 6 J So, 250 kWh of energy = 3.6 × 10 6 × 250 J = 9 × 10 8 J Thus, 250 units of electrical energy is equal to 9 × 10 8 joules.

What is the SI Unit of Energy? Following is the table of SI units: SI unit joules Interestingly, the name of this international unit is kept in honour of James Prescott Joule, a British physicist whose works contributed to the establishment of the energy concept. When we look at the unit in fundamental terms, 1-N.m is equal to 1 joule and, in terms of SI base units, it can be represented as: What is the CGS Unit of Energy? Following is the table of the unit in the CGS system: CGS unit erg One erg is equal to 10 -7 J. An erg is defined as the amount of work done by the force of one dyne at a one-centimetre distance. Watch the video and learn more about work, energy and power from the video Units of Energy List Energy units can be preceded by various factors, and there are usually different units for measuring energy. Some common units include: • British thermal unit (BTU) • Kilowatt-hour (kWh) • Calorie • Electronvolts (eV) • Hartree (the atomic unit of energy) • Rydberg units • Barrel of oil The commercial unit of energy is 1 kWh. One kilowatt-hour is defined as the amount of energy consumed by a device in one working hour at a constant rate of one kilowatt. The SI unit of energy is joule. Therefore, the relationship between commercial and SI units of energy is: 1 kWh = 1kW x 1h = 1000W x 1h = 1000(J/s) x 3600 s = 3.6 x10 6 J

Electric energy: • A kilowatt-hour is a commercial unit of electrical energy ( kWh ) • A kilowatt-hour is a unit of energy equal to one kilowatt of power ( 1 kW ) expended for one hour ( 1 h ) . • It's simply a unit of measurement that represents the amount of energy used if a 1000-watt appliance was left on for one hour. • It would take 10 hours to accumulate 1 kWh energy if you switched a 100-watt light bulb • Although the kilowatt-hour is not a recognized system unit, it is widely used in electrical applications. • The unit of electrical energy is the kilowatt-hour ( kWh ), which is the same for commercial and home use. • Commercial apartments have separate rates of charge, which are higher than residential unit charges. 1 kWh , can be converted to joule as 1 kWh = 1 kW × 1 hour As we know, 1 kW = 1000 W And 1 hour = 3600 sec 1 kWh = 1000 W × 3600 sec 1 kWh = 3 . 6 × 10 6 J Therefore, the commercial unit of electric energy is a kilowatt-hour.