4(2256 kJ / kg)(0.018 kg)4.06 10 JQLm===×. The thermal energy is supplied by Joule heating of the resistor: 2QPtIRt= ∆=∆. Since the resistance over the length of water is ( )( )552150m0.120 m1.2 1015 10mwLRAρ−Ω⋅=×Ω×, the average current required to vaporize water is
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