The power supply used in a solar energy storage system contains 1200 rechargeable cells, each of electromotive force (e.m.f.) 2.0 V2.0\text{ V}2.0 V.
The cells are contained in packs in which all the cells are in series with each other. The e.m.f. of each pack is 80 V80\text{ V}80 V.
Calculate the number of packs in the power supply.
When in use, each pack supplies a current of 4.5 A4.5\text{ A}4.5 A.
Calculate the rate at which each cell is transferring chemical energy to electrical energy.
The packs are connected in parallel to supply a large total current to the energy storage system. Explain why it is necessary to use thick wires to carry this current.
52 exam-style questions on CIE IGCSE Physics 4.3.2a Series circuits. Each one has a worked solution and a mark scheme showing where the marks go.