A unit of energy equal to using 1,000 watts of power for one hour.
A kilowatt-hour (kWh) is the standard unit for measuring electricity consumption. It equals 1,000 watts used for 1 hour.
kWh = (Watts × Hours) ÷ 1,000
A 100W light bulb running for 10 hours uses: (100 × 10) ÷ 1,000 = 1 kWh. At $0.16/kWh, that costs $0.16.
The average American home uses about 900 kWh per month (~$150/month at the national average rate).
The relationship between voltage, current, and resistance in an electrical circuit: V = I × R.
A rotational force that causes an object to rotate around an axis, measured in newton-meters or foot-pounds.
A unit of heat energy equal to the amount needed to raise one pound of water by one degree Fahrenheit.
A material property that measures how well it conducts heat, expressed in watts per meter-kelvin (W/m·K).
The amount of heat energy required to raise the temperature of one unit mass of a substance by one degree.
Stress is the internal force per unit area in a material; strain is the resulting deformation (change in shape or size).