Lesson 40 of science

We are learning about batteries this week in science. Batteries are Electrochemical devices. The chemical energy in a battery is converted into electricity. Chemical reactions occur within a battery. Through these reactions, electricity is generated. Batteries can be classified into the following types:

  • Alkaline batteries which are very popular
  • Nickel-cadmium these are very good for things like robots because they have high capacity
  • Nickel metal hydride these have higher quality, no memory and very expensive
  • Lithium-ion which are laptop batteries, they have very good quality
  • Sealed lead-acid these provide a lot of current and are very good for large robots

Chemical reactions inside a battery produce voltage, which is the electric pressure produced by the reactions. About 1.5 volts would be the voltage of a small battery such as a double-A battery. You would need a battery with 15 volts to power a car.

      Batteries can deliver a certain amount of current based on their capacity. 100 amps x 5 equals 5 hours of amps for twenty hours, so 100 amps x 5 = 100 amps for twenty hours

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