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| From: | To: |
| Unit | Symbol | Description |
|---|---|---|
| Joule | J | Measures the energy or work done. |
| Watt | W | Measures the rate of energy transfer. |
| Calorie | cal | Measures the amount of energy needed to raise the temperature of 1 gram of water by 1°C. |
| Electronvolt | eV | Measures the energy gained by an electron when it is accelerated through an electric potential difference of 1 volt. |
| British Thermal Unit | BTU | Measures the amount of energy needed to raise the temperature of 1 pound of water by 1°F. |
| Kilowatt-hour | kWh | Measures the energy consumption of 1,000 watts over one hour. |
Energy is the capacity to do work or produce change. It can exist in various forms such as kinetic, potential, thermal, electrical, chemical, and nuclear energy.
Kinetic energy is the energy of motion, while potential energy is the stored energy of position. For example, a moving car has kinetic energy, and a rock at the top of a hill has potential energy.
Electrical energy is generated by converting other forms of energy, such as mechanical energy in turbines, chemical energy in batteries, or solar energy in photovoltaic cells, into electrical energy.
The standard unit of energy is the joule (J). Other units include the calorie (cal), kilowatt-hour (kWh), and British Thermal Unit (BTU).
The law of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another. The total energy in a closed system remains constant.
Renewable energy comes from sources that are naturally replenished, such as solar, wind, hydro, geothermal, and biomass. These sources are sustainable and have a lower environmental impact compared to fossil fuels.
Energy is the capacity to do work, while power is the rate at which energy is used or transferred. Power is measured in watts (W), and energy is measured in joules (J) or kilowatt-hours (kWh).
A solar panel converts sunlight into electrical energy using photovoltaic cells. When sunlight hits the cells, it excites electrons, creating an electric current that can be used to power devices or stored in batteries.
Energy efficiency refers to using less energy to perform the same task or produce the same outcome. It involves adopting technologies and practices that reduce energy consumption and waste.
An energy audit assesses the energy use of a building or system to identify opportunities for improving energy efficiency and reducing costs. It involves analyzing energy consumption patterns and recommending measures to enhance efficiency.