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Match the storage medium with the form in which it holds energy.

1. Pumped hydro   2. Supercapacitor   3. Phase change material

P. Latent heat   Q. Potential energy   R. Separated electric charge

  • A.1-R, 2-Q, 3-P
  • B.1-Q, 2-P, 3-R
  • C.1-P, 2-R, 3-Q
  • D.1-Q, 2-R, 3-P

Answer: D

The form of storage determines the response time, the standing loss and the cost, so it is the first thing to establish about any medium. Mechanical, electrical, electrochemical and thermal stores behave quite differently.

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