\(\).#4) a hot-water heater is rated at \( 4.5 \times 10^{3} \mathrm{~W} \) and operates at \( 2.4 \times 10^{2} \mathrm{~V} \) (a) Find- resistance in heating the element (b) How long does it take to heat \( 12 \mathrm{~L} \) of water from \( 20^{\circ} \mathrm{C} \) to \( 50^{\circ} \mathrm{C} \) neglecting conduction and other losses)