secondary cells

• secondary cells can be ....

  recharged and reused again by passing current through the circuit in the opposite direction to the current during discharge.
• benefit?

  Rechargeable

  Lower costs in long term
• disadvantage?

  Higher initial cost

  Safety/health issues

  Lower energy density
• why is power source needed for electrolytic cells?

  Cell potential is not spontaneous

  Thus, external voltage required to drive reaction

  • no voltage = no reaction