The Kilowatt (KW) is a measurement unit of the power rate of an electrical device.
1 KW = 1000 Watt
In this blog we’ll learn:
- How to calculate Kilowatts.
- What does kwh mean.
- How to calculate kwh.
How to Calculate Kilowatts
The Kilowatt is the unit of Power, so if we want to measure it then we need to Calculate the power.
Power= I * U * cos(Θ)
This equation consisits of:
Current (I):
The current and the power are directly proportional, if the current increases then the power will increase.
Voltage (V):
The voltage and the power are also directly proportional, if the voltage increases then the power will increase.
Power Factor (cos(Θ)):
The Power factor is the ratio of working power, It’s also the amount of power used to run machinery and equipment during a certain period. Increasing power factor will decrease the reactive power (Q) which will mean more effecient use of electric power.
If the power angle Θ was 0
but if the power angle Θ was 180
What Does Kilowatt – Hour (KWh) Mean
A kilowatt-hour is a unit of measure for energy usage. It’s using one kilowatt of power (1000 watts) used for one hour. The higher the power rate (KW) of device and the longer it’s being used the higher the KWh.
How to Calculate KWh
Let’s take for example this table:
| Electrical Device | Power (Kw) | Time Used (h) | Energy Consumed (KWh) |
| Refrigerator | 400 | 12 | 4800 |
| Led Light | 10 x 10 LED Lights | 8 | 800 |
| Laptop | 60 | 8 | 480 |
| 32-inch LED TV | 45 | 3 | 135 |
Final Thoughts
Whether you are an Electric Engineer or now, It’s important to understand the Kilowatt and Kilowatt-hour so you can control your energy usage which will reflect on your electric bill in the end.
