If a 1.6 V battery stores 5.4 kJ of energy (a reasonable value for an inexpensive C cell), for how many minutes could it sustain a current of 1.4 A ?
-
First find the power produced by the battery:
P = IV
P = (1.4 A)(1.6 V)
P = 2.24 W
Power is just energy divided by time (1 W = 1 J/s):
P = E / t
Solve for t:
t = E / P
t = (5400 J) / (2.24 W)
t = 2411 s
t = 40.2 minutes
P = IV
P = (1.4 A)(1.6 V)
P = 2.24 W
Power is just energy divided by time (1 W = 1 J/s):
P = E / t
Solve for t:
t = E / P
t = (5400 J) / (2.24 W)
t = 2411 s
t = 40.2 minutes