Can 1 unit of electricity be expressed in terms of kVA? If so then how much is it?
Sure it can. Simply means Kilo-volt amps, so any value would be aproximaely 1000 volt amps, which translates to 125 Amps or so.
the best way to express this is in energy, a watt-hour. It can be calculated by multiplying watts by hours. So if you have an appliance that uses 300 watts and it is turned on for 10 hours that is 3000 watt hours, or 3 kW-hr.
1000 watt hours, that is, 1 kW-hr costs about 10 cents.
Volt amperes are related to watts, they are the total power used, including the reactive part. You can assume they are equal to watts for simplicity.
So if you multiply VA by hours, you get watt-hours, and 1000 of those cost 10 cents.
