Energy efficiency technologies aim to minimize energy consumption while maintaining or improving the level of service or output.

The first law of thermodynamics states that energy cannot be created or destroyed, only transferred or transformed.

Energy efficiency is measured as the ratio of useful energy output to total energy input.

Active energy efficiency technologies require external power to operate, such as variable-speed motors that adjust their speed to optimize energy consumption.

Energy conservation refers to the reduction of energy consumption without sacrificing the level of service or output.

Passive energy efficiency technologies do not require external power to operate, such as insulation that reduces heat transfer.

The energy payback period is the time it takes for an energy efficiency investment to recover its initial cost through energy savings.

Improving energy efficiency in buildings involves a combination of strategies, including using energy-efficient appliances, improving insulation, and optimizing heating and cooling systems.

Renewable energy is generated from natural sources that are constantly replenished, such as solar, wind, and hydro.

Renewable energy technologies generate energy from natural sources, such as solar photovoltaic systems that convert sunlight into electricity.

Energy sustainability involves using energy in a responsible and sustainable manner, considering both environmental and economic factors.

Achieving energy sustainability involves a combination of strategies, including reducing energy consumption, increasing energy production from renewable sources, and improving energy efficiency.

Energy demand management involves reducing energy consumption through behavioral changes and lifestyle adjustments.

Energy demand management strategies involve reducing energy consumption through behavioral changes, such as turning off lights when leaving a room.

An energy audit involves assessing and improving the energy performance of buildings and systems.