A storage type geyser contains 10 kg of water at 10°C. The geyser has a power rating = 1000 W and efficiency of conversion of electric power to heat = 75% . If the geyser remains on for 20 minutes, wh

Question

A storage type geyser contains 10 kg of water at 10°C. The geyser has a power rating = 1000 W and efficiency of conversion of electric power to heat = 75% . If the geyser remains on for 20 minutes, what will be the final temperature of water in the geyser?

TestHub · Accepted Answer

Effective heating power: P heat ​ = 1000 × 100 75 ​ = 750 W Heat supplied in 20 min: Q = 750 × 20 × 60 = 9.0 × 1 0 5 J Use heat gained by the 10 kg of water: Q = m c Δ T = 10 × 4200 × ( T − 10 ) T = 31. 4 ∘ C Answer B.

Physics - Heat & Thermo Question with Solution | TestHub

Options:

Doubts & Discussion