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.
Modern electric utilities not only produce the power they need for their consumers but also pool and coordinate excess electricity with other utilities. In 2001, the United States had the ability to produce over 788 million megawatts of electrical energy.