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## Unidades de medición - **Joule (J):** The unit of measurement mostly used to refer to transformations that occur due to the movement of objects. For example, the energy needed to lift an object weighing 100 grams to a height of 1 meter is 1 J. - **Caloría (cal):** The measuring unit used to in...

## Unidades de medición - **Joule (J):** The unit of measurement mostly used to refer to transformations that occur due to the movement of objects. For example, the energy needed to lift an object weighing 100 grams to a height of 1 meter is 1 J. - **Caloría (cal):** The measuring unit used to inform the amount of energy provided by a food or the thermal energy of a stove. For example, an apple has 52 cal. This unit is often expressed in kilocalories (kcal), for example, a heater can consume 2,000 kcal per hour. - **Watt-hora (Wh):** The most used unit of measurement when dealing with electricity. It's used to bill electrical consumption at home or to indicate the consumption of an appliance. For example, a cell phone charger consumes 5 Wh. ## Conservación de la energía The principle of conservation states that energy is neither created nor destroyed, but the total amount of energy in the universe remains constant. Therefore, only two phenomena occur: the transformation and the transfer of energy. - **Transformations:** They occur when one form of energy is converted into another. For example, when we eat chocolate, our body transforms it into body heat. - **Transfers:** The energy is "moved" from one object to another, without being destroyed. For instance, if we hit a ball with a bat, the bat transfers part of its kinetic energy to the ball. The image also describes examples of how energy transforms from one form to another, like in the case of a battery, the chemical energy is transferred to the light bulb and transformed into light and thermal energy.