Question 1

How do energy and power relate?

Accepted Answer

Energy = Power × Time. 1 kW for 1 hour = 1 kWh. Power is rate of energy use.

Question 2

How do you convert power to energy?

Accepted Answer

Multiply power by time. 500W for 2 hours = 1000 Wh = 1 kWh.

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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