In our first contellation we learnt alittle about AC and DC, terms which come up form time to time. DC meaning Digital Current which goes either on or off, 0 or 1. Or Analogue Current which has ranging different values.
AC – alternating current, the electric charge periodically reverses. Used in plug points, provides power to homes.DC – direct current , the electric charge flows in one direction. used in batteries, power packs.
When looking at the wiring inside things e.g. toys, wires connected to battery: red for + black for –