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Compared with a battery, a supercapacitor offers

  • A.lower power density and higher energy density
  • B.the same power and energy density at lower cost
  • C.higher power density and lower energy density
  • D.higher power density and higher energy density

Answer: C

It can absorb or release its content almost instantly, which suits regenerative braking and pulse loads, but holds only enough for seconds of duty. Batteries and capacitors are often combined so each does what it does best.

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