Core DC Quantities, Ohm’s Law, Power, and Energy

Match charge, current, voltage, resistance, power, and energy to their symbols, units, and typical measuring instruments.

Determine conventional-current direction and electron-flow direction in a DC circuit.

Calculate charge, current, or time using the relationship between charge and current.

Calculate voltage, current, or resistance using Ohm’s law.

Determine conductor resistance from resistivity, length, and cross-sectional area.

Calculate electrical power using the appropriate voltage, current, or resistance relationship.

Calculate electrical energy and operating cost from power, time, and a stated tariff.

Calculate efficiency from stated input and output power or energy.