Question

Which type of cell would you like to use if your device requires(i)a current of 70A for 20s

Answer 1

Answer:

if the device requires 70A for 20s, then it is more appropriate to use a galvanic cell. e.g Daniell cell which gives contains the flow of the 1.8 emf

hence, the type of cell used should be galvanic cell not electrolytic cell.  

oxidation-reduction reactions produce electrical energy

• Galvanic or voltaic cells involve spontaneous electrochemical reactions in which the half-reactions are separated (Figure 2) so that current can flow through an external wire.

• galvanic cell: electrochemical cell that involves a spontaneous oxidation-reduction reaction; electrochemical cells with positive cell potentials; also called a voltaic cell