a battery can provide a current of 4.2 A at 2.0V for 9.0 HR how much energy in k

Question

a battery can provide a current of 4.2 A at 2.0V for 9.0 HR how much energy in kj is produced Question 14 of 17 (2 points) x Incomect A battery can provide a current of 4.2 A at 2.0 V for 9.0 hr. How much energy (in kJ) is produced? Number Energy 40.4 kJ Energy is related to current and voltage by the following equivalencies: 1 (coulomb)(volt) 1 Joule 1 (ampere-second) (volt) How can you use the information provided to solve for the energy the battery can produce? Try Again Q view solu Progress: 6 9 10 15 16 17 Exit Activity Activity Grade: 36 points possible

Explanation / Answer

Recall that

P = I*V

where P = power

I = current, V = voltage

so

P = I*V = (4.2)(2) = 8.4 W

now

t = 9 h = 9*3600 = 32400 seconds

Total Energy used

E = P*t = 8.4*32400

E = 272160 J

E = 272.160 kJ

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