I need a little help with my electrical engineering homework. (Electrical Potential)?

Posted on 2014-04-21 09:20:00 in Engineering by MAC

A car battery has a mass of 25 kg. Starting from a fully charged state, it can supply 8 A for 20 hours with a terminal voltage of 12.6 V before it is totally discharged.



A: If the energy stored in the fully charged battery is used to lift the battery with 100% efficiency, what

height is attained? Assume that acceleration due to gravity is 9.81 m/s^2 and is constant with height.



B: If the stored energy is used to accelerate the battery with 100% efficiency, what velocity is attained?



C: Gasoline has an energy density of approximately 4.5*10^7 J/Kg. Compare this with the energy density for the fully charged battery. Explain how this relates to the range limitations with electric vehicles.



So, in A, I understand that this is going to be Electric Potential = Gravitational Potential (MGH). I'm just not sure how to find the electric potential.



B, I understand that this Electric Potential = Kinetic (.5MV^2)



C... Not sure where to start.

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