 |
| Commercial Unit of Energy |
|
| The SI unit joule is too small to express very large quantities of energy. Hence we use a bigger unit called kilowatt hour (kWh) to express energy. |
| |
| 1 kWh is the amount of energy consumed by an electrical gadget in one hour at the rate of 1000 J/s or 1kW. |
| |
| The energy used in households, industries and commercial establishments are usually expressed in kilowatt hour. |
| |
|
| SI unit of energy is Joule. |
| |
| Commercial unit of energy is kWh. |
| |
| 1 kWh = 1 kW x 1 h |
| |
| = 1000 W x 3600 s |
| |
| 1 watt - second = 1 joule |
| |
| 1 kWh = 3600000 J |
| |
 |
| |
