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.
UK utilities face their biggest challenge in security of supply. The average excess of supply over peak demand could fall to 1.2% in 2015-16 versus 4.1% in 2014-15, mainly based on underinvestment in new power plant capacity.