Chapter Summary
Alternating current (AC) is the type of electricity that is routed to homes and offices via transformers and wall outlets.
Alternating current changes polarity as it is manufactured by power stations.
Batteries provide direct current (DC) that does not change polarity.
DC current flows in one direction, from the negative terminal to the positive terminal.
Wiring problems are categorized by the wires they involve.
Common mode problems involve the neutral wire and safety ground wire.