【单选题】Consider a refrigeratior that consumers 320 W of electric power when it is running. If the refrigerator runs only one quearter of the time and the unit cost of electricity is $0.09/kWh. The electricit...
【简答题】Choose one word from the word list below to fill in the blank in each of the following sentences. a. ampere b. fault c. alternating current (AC) d. generator 1. ( ) is electric current that alternate...