To calculate the change in temperature, subtract the initial temperature from the final temperature. Example: 84.2 degree Fahrenheit - 41 degrees Fahrenheit = 43.2 degrees Fahrenheit. The temperature from morning to afternoon changed by 43.2 degrees Fahrenheit.
It needs 12 volts so it will be the standard modern power supply provides 12 volts of power.
A CT for operation on a 110 kV grid. A current transformer (CT) is a type of transformer that is used to measure AC Current. It produce an alternating current (AC) in its secondary which is proportional to the AC current in its primary.