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The BTU is the imperial unit for thermal energy, particularly used in HVAC (heating, ventilation, and air conditioning) systems in North America.

The calorie is a unit of thermal energy defined as the heat required to raise 1 gram of water by 1°C. While largely superseded by joules, it remains in some scientific contexts.

The electronvolt is the natural energy scale for atomic and subatomic processes. It's the energy gained by an electron when accelerated through a potential difference of 1 volt.

The gigawatt is a unit of power used to measure the output of large-scale power generation facilities and the consumption of entire electrical grids. One gigawatt is enough to power approximately 700,000 homes.

The horsepower is an iconic imperial unit for measuring power, defined historically as the power output of a draft horse. It remains standard for car engines in the US and automotive industry worldwide.

The joule is the SI unit of energy, named after English physicist James Prescott Joule. It's the fundamental unit for all energy calculations in physics and engineering.

The kilocalorie is the "Calorie" you see on food labels in countries using metric units. In the US, this same unit is called a "Calorie" (capital C), creating confusion between the two terms.

The kilojoule is the practical metric unit for food energy on nutrition labels outside the United States. It's also used for describing thermal energy and power outputs.

The kilowatt is the practical unit for measuring moderate to large power levels, from kitchen appliances to electric vehicle charging rates.

The kilowatt hour is the unit you see on your electricity bill. It measures electrical energy consumption and is used by all utility companies globally.

The megajoule is used for measuring large quantities of energy in industrial contexts, such as fuel energy content or power plant outputs.

The megawatt is used for measuring large power generation and consumption. Power plant capacities, solar farms, and wind turbines are rated in megawatts.

The therm is a unit of energy primarily used by natural gas utilities for billing purposes. It represents a practical quantity of energy that makes gas consumption easier to understand on customer bills.

The watt is the SI unit of power named after Scottish engineer James Watt. It's displayed on every electrical device, from light bulbs to appliances and power supplies.

The watt hour is the practical unit for battery capacity and stored electrical energy. It's displayed on battery labels and power banks worldwide.