| 摘要 |
A method for providing estimated power costs incurred by an electrical appliance, which is plugged into a receptacle of an extension cord, includes enabling operation of the extension cord so as to measure electric current flowing through a receptacle, so as to compute an amount of electricity consumed by the electrical appliance within a predetermined period of time based on the electric current measured by the extension cord, so as to compute the estimated power costs incurred by the electrical appliance based on the amount of electricity computed by the extension cord, and so as to inform the costs computed by the extension cord to a user. An extension cord that performs the method is also disclosed.
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