What are all the different ways to store energy besides using rechargeable batteries?
Human beings have been looking for a good way to store energy for a long time. One of the major things that has been holding up electric cars is battery technology — when you compare batteries to gasoline, the differences are huge. For example, a typical electric car might carry 1,000 pounds (454 kg) of lead-acid batteries. Those batteries take several hours to recharge, and might give the car a 100-mile (160-km) range. Two or 3 gallons of gasoline give the same range, weigh less than 30 pounds (13 kg), and you can pump that much gasoline in about a minute. Here is a list of other technologies that people commonly use to store energy. Some of these work in an electric car, while others are better for stationary applications: • One of the oldest techniques people have used is the falling weight. You lift the weight to store the energy in it and then let the weight fall to extract the energy. Many grandf
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