Question

An electric water heater has to supply hot water 40 0C at a constant rate of 1 kg s-1 from water at 30 0C. If the heat loss to surroundings is neglected, the minimum power of the heating element of the heater should be ( specific heat capacity of water 4200 J kg-1 0C -1 ) (1) 4.2 x 104 W (2) 4.2 x 103 W (3) 1.2 x 104 W (4) 1.8 x 104 W (5) 1.8 x 103 W​

Answer 1

(1) 4.2 × 104 W

Step by step explanation