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.
The electric supply from the utility company uses alternating current, which is the type of supply required by the vast majority of electric devices in homes and businesses. For this reason, solar PV systems use a device called an inverter, which is capable of converting DC power to AC power.