On 6/23/2015 1:55 PM, Tony Hwang wrote:

Ohm's law is very simple to understand. If you used extension cord of
proper size(capacity to carry the current without too much voltage drop)
There shouldn't be a problem. a/c or freezer has motor which draws peak
current when it starts due to it's characteristics of inductive load)
Undersized cord is even fire hazard.

Ohm's law states that the current through a conductor between two points
is directly proportional to the potential difference across the two
points. Introducing the constant of proportionality, the resistance, one
arrives at the usual mathematical equation that describes this relationship