SerCP11 17P044 Batteries are rated in terms of amperehours A

SerCP11 17.P.044 Batteries are rated in terms of ampere-hours (A h). For example, a battery that can deliver a curent of 3 at 15 A h .0 A for 5.0 h is rated (a) What is the total energy, in kilowatt-hours, stored in a 12-V battery rated at 46 A hi? 0.414 Your response differs from the correct answer by more than 10%. Double check your calculations. kWh (b) At $0.12 per kilowatt-hour, what is the value of the electricity that can be produced by this battery? 4.968 Your response differs from the correct answer by more than 10%. Double check your calculations. Need Help?Resd The potential difference across a resting neuron in the human body is about 61.0 mV and carries a current of about 0.195 mA. How much power does the neuron release? 11895 10\"X Nead Help?

Solution

a) energy, E= power*time = V*I*t

given, I*t= 46 A-h

E = 12*46 = 552 W-hour = 0.552 kW-h

b) 1 kWh = $ 0.12

0.552 kWh = 0.12*0.552 = $0.06624

c) power, P = V*I

P=61*10^-3*0.195*10^-3

P = 1.1895*10^-5 W