Answer:
$3.51
Explanation:
The energy (E) delivered by a system is the product of the power (P) dissipated by the system and the time (t) taken for the dissipation. i.e
E = P x t -----------------------(i)
Where;
The power (P) is the product of the current (I) flowing through the system and the voltage (V) across the system. i.e
P = I x V
Substituting P = I x V into equation (i) gives;
E = (I x V) x t
=> E = IVt --------------------(ii)
<em>From the question;</em>
Current (I) = 0.3A
Voltage (V) = 1.3V
time (t) = 75 hours = 75h
<em>Substituting these values into equation (ii) gives;</em>
=> E = 0.3 x 1.3 x 75
=> E = 29.25 Kwh
The energy delivered is 29.25Kwh
But in the U.S;
$0.12 = 1Kwh
=> 29.25Kwh = 29.25 x $0.12
=> $3.51
Therefore, the cost of the energy delivered by this battery per kilowatt hour is $3.51