1 commercial unit of electrical energy is equal ____________ to joules.

Correct option is D

The correct answer is (D)    3.6 ×$$10^6$$​

• One commercial unit of electrical energy, known as a kilowatt-hour (kWh), equals 3.6 × 10⁶ joules.
• The kilowatt-hour is used as the standard unit for measuring electrical energy because the joule, the official SI unit, is too small to represent large energy amounts conveniently.
• A kilowatt-hour represents the energy consumed by an electrical device running at a constant power of 1 kilowatt for 1 hour.