$$E _ { L I N E } = \sqrt { E_ R ^ { 2 } + E_ X ^ { 2 } }$$

Short Answer

$$E _ { L I N E } = \sqrt { E_ R ^ { 2 } + E_ X ^ { 2 } }$$ What voltage is required to force a 4.5-amp current through an electric iron having a resistance of 25.5 ohms?