Question 1

How do you calculate electricity cost?

Accepted Answer

Cost = kWh used × price per kWh. A 100W device for 10 hours = 1 kWh. At /bin/zsh.12/kWh = /bin/zsh.12.

Question 2

What uses the most electricity at home?

Accepted Answer

HVAC (40-50%), water heating (14%), appliances (13%), lighting (9%). Varies by region and habits.

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.

Energy Unit Converter - Free Online Tool

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