One kilowatt electric heater is to be used with 220V d.c. supply. (i) What is the current in the heater? (ii) What is lts resistance? (iii) what is the power dissipated in the heater? (iv) How much heat in calories is produced per second? (v) How many grams of water at `100^(@)C` will be converted per minute into steam at `100^(@)C`, with the heater? Assume that the heat losses due to radiation are negligible. Latent heat of steam=540cal per gram.

Answer

(a) `50/11=4.55A`
(b) `(22xx11)/(5)=48.5Omega`
1000 W
240 cal `s^(-1)`
( e) 80/3 gm