- #1
physicskillsme
- 24
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Extracted from another thread tha had got a bit messy.
The immersion heater in an electric hot water system is rated at 9 kW. If the tank is initially filled with 40 gallons (about 150 litres, with a mass of 150 kg) of cold water at 15 oC, how long will it take the heater to raise the temperature to 40 oC?
Ok this is as far as I have got:
Q=CmdeltaT
deltaT=40-15 = 25
q=Q=4196*150*25
15735000J
Ok so now I need to get time.
p=deltaq/deltat
So to get time do I just say time=p*delta q ?
The immersion heater in an electric hot water system is rated at 9 kW. If the tank is initially filled with 40 gallons (about 150 litres, with a mass of 150 kg) of cold water at 15 oC, how long will it take the heater to raise the temperature to 40 oC?
Ok this is as far as I have got:
Q=CmdeltaT
deltaT=40-15 = 25
q=Q=4196*150*25
15735000J
Ok so now I need to get time.
p=deltaq/deltat
So to get time do I just say time=p*delta q ?