Join 60,000+ competitive exam aspirants
or with email
Your Cart
Subtotal₹0
Total₹0
Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
Join 60,000+ competitive exam aspirants
What is the value of 1 kWh in Joule(J)?
3.6×105
3.6×10−5
3.6×106
3.6
3.6×106
The kilowatt-hour (kWh) is a unit of energy, defined as the energy consumed by a device with a power rating of one kilowatt operating for one hour. By converting the power (1 kW = 1000 W) and the time (1 hour = 3600 s) into SI units, we determine that 1 kWh=1000 J/s×3600 s=3.6×106 Joules.
The kilowatt-hour (kWh) is a unit of energy, defined as the energy consumed by a device with a power rating of one kilowatt operating for one hour. By converting the power (1 kW = 1000 W) and the time (1 hour = 3600 s) into SI units, we determine that 1 kWh=1000 J/s×3600 s=3.6×106 Joules.
Think of a 1000-watt electric heater running for exactly one hour; the total 'work' or heat energy it produces in that time is exactly one unit of electricity, which is 3.6 million Joules.
E=P×t
1 kW=1000 W
1 h=3600 s
Energy is calculated as the product of Power and Time (E=P×t). Since Power is measured in Watts (Joules per second) and time in seconds, the SI unit for energy is the Joule (J). Converting 1 kW to 1000 Watts and 1 hour to 3600 seconds results in 1000×3600=3,600,000 Joules, which is expressed in scientific notation as 3.6×106 J.
The kilowatt-hour is a commercial unit of electrical energy.
1 kWh is commonly referred to as '1 unit' of electricity in domestic billing.
The Joule is the SI unit of energy.
Convenient unit for measuring large amounts of electrical energy consumed by households and industries.
Electricity utility billing.
Measuring cumulative energy output of power plants.
The value 3.6×105 is incorrect, 3.6×10−5 is too small, and 3.6 is just a coefficient without the exponent.
The correct value is 3.6×106 J.
C is correct — 1 kWh is equal to 3.6×106 Joules.
Always remember that 1 kWh = 3.6 Megajoules (MJ). This conversion is a classic, highly frequent question in RRB and other competitive technical exams.
Get instant step-by-step AI explanations, full shift Previous Year Papers (SSC GD, RRB, SSC JE), and regional rank analysis on the official Examoogle App.
Free Download • 100K+ Aspirants