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.
North American Voltage Ranges. In the United States and Canada, the electrical power supplied to most homes is from a split-phase system. That power enters your home at about 240 volts, that voltage is split at the main circuit breaker panel into two 120 volt halves. Those 120 volt halves are routed through the home to outlets.This 120 volt level is commonly referred to as 110, 115, 120, or 125 volts.