Question 1

What energy units can be converted?

Accepted Answer

Joules, calories, BTU, kWh, electron volts, ergs, foot-pounds, and various thermal units.

Question 2

What is the relationship between energy units?

Accepted Answer

1 kWh = 3.6 MJ = 3412 BTU. 1 cal = 4.184 J. 1 eV = 1.602×10⁻¹⁹ J.

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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