In measuring an appliance Kwh, Do calculate the measurment of the voltage, current or power?

Im trying to calculate how much it might cost to use an appliance {eg, toaster}. I still dont quite get the difference between them.|||you want the power





sometimes we use a water analogy to help understand electrical currents





if you think of an electrical flow through the wire as sort of like water flow through a pipe, then the voltage would be like the pressure of the water, and the current would be like the flowrate or amount of water





so how many volts lets us know how hard the electricity is pushing, and the amps (current) tell us how much is flowing





amps times voltage gives us power





a Watt is a volt-amp





120 V can push about .8 amps through a 100W light bulb





120v*.8a=96watts





if you burn a burn 10, 100 watt lightbulbs for 1 hour, that is one KW-hr (KWh) which is how we are generally billed





you may pay 10 to 20 cents per Kwh in many places in north america|||voltage x current x time {in hours}.=Kwh.|||Power = voltage x current.


Power is expressed by watts.





120 volt toaster using 10 amps = 1200 watts.





Kwh = kilo watt per hour (1,000 watts per hour).





So, 1200 watt toaster divided by 1,000 = 1.2 kwh.





If you are paying 10 cents per kwh then you would use 12 cents per hour to run the toaster.