Capacitors - Electrical energy storage

• Capacitors are the most popular non-chemical method of storing electricity and their invention predates the battery

  
• Capacitors

  They consist of 2 plates of opposite polarity; when the capacitor is charged, the positive charges migrate to one plate and the negative to the other

  
• Super capacitors are used in electric vehicles because they can be recharged many more times than batteries - millions as opposed to thousands of times - which makes them suitable for use in regenerative braking systems where the energy used to slow the vehicle is stored and used to drive the motor