Basic electrical engineering theories and concepts include understanding how electrical currents and voltages work and knowledge of how Ohm's Law pertains to series and parallel circuits. Basic circuit laws, such as Kirchoff's Voltage Law, help engineers design circuits and electrical systems that comprise numerous electronic devices.
The most elementary concepts in electrical engineering are how electric current flows and how polarity changes affect this process, creating alternating currents that power most every home appliance and direct currents that comprise batteries and solar cells. The most fundamental law in electrical theory is Ohm's Law, which measures the work required to move a charge between two points. Use of this law allows electrical engineers to wire a series of circuits that power multiple items one after the other and wire parallel circuits that deliver concentrated power to a single source.