Why is it unrealistic to think you will get to your destination on time if you are running late in the scenario described above?
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Ответ:
(a) 423 J
The power of the battery is the ratio between the total energy stored (E) and the time elapsed (t):
However, the power is also the product of the voltage (V) and the current (I):
Linking the two equations together,
Since we know:
V = 9.0 V
We can calculate the total energy:
(b)
dollars
The battery has a total energy of E = 423 J. (2)
1 Watt (W) is equal to 1 Joule (J) per second (s):
so 1 kW corresponds to 1000 J/s:
Multiplying both side by 1 hour (1 h):
and
, so
So we find the conversion between kWh and Joules. So now we can convert the energy from Joules (2) into kWh:
And since the cost is $0.0660 per kilowatt-hour, the total cost will be