Heat
The hotter something is, the more energy it has. Heating something is a way of transferring energy from one place to another.
Helium
Helium is an element (it contains only one kind of atom). Helium atoms are the second smallest after hydrogen. Two hydrogen atoms can fuse to become one helium atom. This happens in the Sun.
Hydroelectric
Hydroelectric power is a way of generating electricity from running water. It involves building a dam across a river to control the running water and capture its energy. Hydroelectric power is renewable, but dams can have a massive impact on the environment.
Hydrogen
Hydrogen is an element (it contains only one kind of atom). Hydrogen atoms are the smallest atoms of all. In the Sun they stick together to make helium and light. When hydrogen and oxygen join together they make water. When this happens in a fuel cell we can make electricity.
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