An electric kettle is rated at 500w. The time taken to heat 0.5 litre of water from 30 degree celsius to 10 degree celsius in this kettle is?
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Power of cattle p= 500w
working v=200v
heat developed in 30s
h=pt, 500*30=15000j
let delta t be rise in tamp: of water
therefor
h=m*s*delta t
15000=0.4*4200*delta t
delta t = 8.93 deg centigrade.
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