Specific heat capacity is the quantity of heat

Specific heat capacity is the quantity of heat needed to raise the temperature per unit mass. Usually, it's the heat in Joules needed to raise the temperature of 1 gram of sample 1 Kelvin or 1 degree Celsius. Water has an extremely high specific heat capacity, which makes it good for temperature regulation.

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6