1.6. One of the proposals to reduce pollution in congested areas is to encourage the use of electric battery-powered automobiles. In these vehicles an electronic module controls the energy flow from a battery to an electric motor, which drives the wheels of the car through a gear train. The electric current delivered to the motor is established by the driver through adjustment of the controller. We wish to formulate a model for the electric car that is appropriate for operation on a nominally straight, level road. (a) Using an engineering sketch, define the car and propulsion system including inputs and any outputs of interest. (b) In a test drive on an electric vehicle it was found that an average of 20 horsepower was used over the trip duration of two hours. How many joules of electrical energy are used from the battery during the trip? If the car uses 24-volt batteries, what was the average current drawn during the trip (assume that the battery voltage remains constant).