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.
General supply tariff. Tariff 11 the most common residential tariff, providing electricity to your household where you pay for what you use at a flat rate per kilowatt hour thoughout the day and night, plus a service fee and metering services charge.