Rechargeable battery – how much electricity is used?

26th November 2011 Cat: Rechargeable Battery Charger with No Comments »

Hi there,
power consumption.
I just wanted to know how much electricity is consumed when charging rechargeable batteies.
my adapter/plug says 240v and 0.3a.
but back of my battery charger say Input DC 12v – 700ma.
which one do i use to calculate energy consumption. In general is it expensive to charge batties compared to using a ac adapter.
Thanks

Best answer about Rechargeable battery – how much electricity is used?

Answer by sunset
Firstly you must find power used on the AC side. P=VI thus for AC 240 x 0.3.

For total energy consumption always use the AC equation. Charging batteries vs an adaptor is usually comparative and neither is more efficient.

What do you think? Answer below!


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