如果將用電量轉化為安培

每個月的用電量為KW/h，安培係電流量，
如果你將一個1Kw既電器接上220V就係1000/220 = 4.545454A
如果每日用1小時每個月就係1x30=30Kw/h
如果每日用10小時每個月就係10x30=300Kw/h

如果每日用20小時每個月就係20x30=60Kw/h

One [unit] of electricity is 1 kWh (kiloWatt hour), which is a unit of energy.
1 kWh = 3 600 000 J (Joules)

Domestic power outlets in Hong Kong provide a voltage of 220 volts. Usein the equation:
energy = charge x voltage
we can estimate the charge in 1 kWh of electricity used.

3600 000 = 220 x charge
i.e. charge = 3600000/220 coulombs = 16 364 coulombs
That is to say, for every unit (kWh) of electricity consumed, there are 16 364 coulombs of charges delivered.

Assume you have consumed N kWh of electricity in a month, the total amount of charge delivered = 16364N coulombs

The actual current delivered depends on the types and number of electrical appliances that you are using at a particular time. We may, however, calculate the MEAN CURRENT delivered in a month.

Since there are 3600 x 24 x 30 seconds = 2 592 000 seconds in a month
Mean current delivered = 16364N/2592000 amperes = 0.0063N amperes