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.
Report Abuse. There are a few parts to this: AC means that it runs on 'Alternating Current' - mostly mains (rather than batteries) 220 - 240V means that it wants a supply voltage of 220V to 240V, which unfortunately the US domestic electric supplies are 110V - 120V-which is a bit low.ou need an AC power source either in 50 or 60Hz,and voltage can be chose from 220 to 240 volts,and the power requires 250 watts.