Voltage
drop may be neglected when the impedance of the interconnecting conductors is
small relative to the other components of the circuit. For example, an electric
space heater may very well have a resistance of ten ohms, and the wires which supply it may have a resistance of
0.2 ohms, about 2% of the total circuit resistance. This means that 2% of the
supplied voltage is actually being lost by the wire itself. Excessive voltage
drop will result in unsatisfactory operation of electrical equipment, and
represents energy wasted in the wiring system. Voltage drop can also cause
damage to electrical motors.