How long does it take to heat 500 g of water in a glass from 20 C to boiling using an Electronic Boiler with a capacity of 500 BT

Data: Nh (power of the boiler used) = 500 W; m (mass of water in a glass) = 500 g = 0.5 kg; t0 (initial temperature) = 20 ºС; Cw (specific heat capacity) = 4200 J / (kg * ºС); tboil (boiling point) = 100 ºС.

The operating time of the boiler used: t = Qw / N = Sv * m * (tboil – t0) / Nh = 4200 * 0.5 * (100 – 20) / 500 = 336 s = 5 min 36 s.

Answer: Water in a glass can be heated in 5 minutes 36 seconds.