Question 1

What is the most common energy unit?

Accepted Answer

Joules (SI), kilowatt-hours (electricity), calories (food), BTU (HVAC). Depends on industry.

Question 2

Why are there so many energy units?

Accepted Answer

Different fields developed independently. Physicists use joules, nutritionists use calories, engineers use BTU.

Question 3

What's the difference between energy and power?

Accepted Answer

Energy (joules, kWh) is total work done. Power (watts) is energy per unit time. A 100W bulb for 10 hours = 1 kWh of energy.

Question 4

Why are there so many energy units?

Accepted Answer

Different fields developed their own: BTU for heating, calories for nutrition, joules for physics, kWh for electricity billing.

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