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 current source is a piece of equipment that is used to produce or receive an electric current. It is related to the voltage source, which is the dual of the current source. Often, a current source will be used to power various machines, which can derive energy from the electric current produced. There is a wide range current sources available, such as resistor sources, active sources, radio frequency (RF) current sources, and direct current (DC) and alternating current (AC) sources.