he energy efficiency of electric vehicles is usually rated in terms of the​ kilowatt-hours (of​ energy) required to drive 100​ miles, or​ kWh/100 mi. An electric car is rated at 38 ​kWh/100 mi.   a. Is a vehicle rated 27 ​kWh/100 mi more or less efficient than this electric​ car? b. How much energy​ (in kilowatt-hours) is required to drive this electric car 260 miles? c. Assuming electricity costs ​$0.14​/kWh, how much does it cost to drive this electric car 350 ​miles?

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Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.