A particular 12 V car battery can send a total charge of 75 A-h (ampere-hours) t

Question

A particular 12 V car battery can send a total charge of 75 A-h (ampere-hours) through a circuit, from one terminal to the other. (a) How many coulombs of charge does this represent? (Hint: See Eq. 21-3.) (b) If this entire charge undergoes a change in electric potential 12 V, how much energy is involved?

(a)

Number

Units

(a)

Number

Units

C C A particular 12 V car battery can send a total charge of 75 A-h (ampere-hours) through a circuit, from one terminal to the other. (a) How many coulombs of charge does this represent? (Hint: See Eq. 21-3.) (b) If this entire charge undergoes a change in electric potential 12 V, how much energy is involved?

Explanation / Answer

a. charge = current * time =   75*60*60 = 270000 C = 2.7*10^5 C

b. energy U = Vq = 12*2.7 *10^5 = 3.24*10^6 J

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