Battery
Batteries convert electrical energy to chemical energy when they are charging, and chemical to electrical when they are powering loads. Batteries have two terminals of dissimilar materials, an electrolyte, and a separator. The separator prevents the terminals from touching and the electrolyte is the medium in which the electrons flow from the negative (-) to positive (+) terminals. Some battery types are alkaline, nickel cadmium (NiCd), nickel metal hydride (NiMH), lithium ion (Li-ion), and lithium iron phosphate (LiFePO4). The NiCd, NiMH, Li-ion, and LiFePO4 batteries are rechargeable.
Learn more about batteries : TED on batteries, How Batteries Work
Learn more about batteries : TED on batteries, How Batteries Work
Click on the pictures to explore the energy conversions of the Kid Power bike.