Calories are a unit of energy. They cannot be changed to energy because they already are.
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After eating, it typically takes 6-8 hours for the body to fully convert food into energy. The process involves digestion, absorption of nutrients, and transportation of molecules to cells. Once in the cells, nutrients are converted into energy through processes like glycolysis and the citric acid cycle.
Kinetic energy is important for long jumpers because it helps them generate the speed and power needed to take off from the board and propel themselves through the air. By converting their running speed into kinetic energy, long jumpers can maximize their jump distance. The greater the kinetic energy they can build up, the more potential energy they have to turn into distance during the jump.
Water contains potential energy due to its elevated position or pressure in a reservoir or dam. It can be harnessed to produce hydroelectric power by converting this potential energy into kinetic energy through a turbine.
A liquid absorbs energy from its surroundings in order to turn into a gas, a process called vaporization. This energy is used to overcome the intermolecular forces holding the liquid molecules together.
When you turn on a lamp, electric energy is converted into light energy and heat energy. The electric current flowing through the lamp's filament generates heat, which in turn produces light.
When you turn on a flashlight, electrical energy from the battery is converted into light energy and a small amount of heat energy by the light bulb.