Specific heat capacity ; voltage ; heating water

[rishabharora]

Hi,
I am doing an experiment on the factors affecting the time to heat water from a set temperature to another, eg 20 to 35 deg C.
1. First, I have insulated the beaker properly, to minimise heat loss. I have connected a heating element to heat the water. Connected multimeter, give the voltage and current in the circuit. Using this, I can find the energy provided -
P = IV and then P = energy/ time.
Also, this should be equal to mc(delta temp) ; hence i can calculate the specific heat capacity.
I am altering the concentrating by adding salt.
Is this a viable method?? ?
Thanks

 

[cheah10]

For me, this experiment sounds fine. Remember to keep some of the variables to be constant though. Can you tell me all the variables you can think of which must be kept constant?