Q=W
Q=cmΔT
W=cmΔT
ΔT=100C-20C=80C=80K
W=4200 J/kg ×°C*1kg*80K
W=336 000J
t=W/P
t=336 000J/2000W
t=168s
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Q=W
Q=cmΔT
W=cmΔT
ΔT=100C-20C=80C=80K
W=4200 J/kg ×°C*1kg*80K
W=336 000J
t=W/P
t=336 000J/2000W
t=168s