eng.

heat capacity of water


	10 J ml-1 degC-1




example

boil 1 lt water

2400W element


	2400 J sec-1 x 80 degC x 1000 ml x 10 J ml-1 degC-1

	= 2400 J sec-1 x 800,000 J

	= (1/2400 J-1 sec) x 800,000 J

	= 333 sec

	= 5.5 minutes



2.

as a formula


				  power x time
	tempreture change = --------------------------
	 		      heat_capacity x volume

	

power			Watts (J sec-1)  

time			seconds

tempreture change 	degrees C
	 		      
heat_capacity		10 (water), dependant on the type of material

volume			ml



change in tempreture of a solid or liquid (such as water) when heated (by an electical element, 

	for example), or cooled (power extracted from the material, such as to drive a power

	station)



	
