A series circuit has one path for electrons to flow between any two points, so if one component breaks the entire circuit is broken. A parallel circuit has multiple paths so if one component breaks the other paths remain intact. In a series circuit, the current through each resistor is the same while the overall resistance is the sum of individual resistances. In a parallel circuit, the voltage across each resistor is the same while the overall resistance is calculated by taking the inverse of the sum of the inverses of individual resistances. Electric power represents the rate of energy conversion and is measured in watts, while electric energy represents the presence and flow of electric charge and is measured in watt-hours by electric meters.