Power The formula for the power output P of a battery is P = V I − R I 2 where V is the electromotive force in volts. R is the resistance in ohms, and I is the current in amperes. Find the current that corresponds to a maximum value of P in a battery for which V = 12 volts and R = 0.5 ohm. Assume that a 15-ampere fuse bounds the output in the interval 0 ≤ I ≤ 15 . Could the power output be increased by replacing the 15-ampere fuse with a 20-ampere fuse? Explain.
Power The formula for the power output P of a battery is P = V I − R I 2 where V is the electromotive force in volts. R is the resistance in ohms, and I is the current in amperes. Find the current that corresponds to a maximum value of P in a battery for which V = 12 volts and R = 0.5 ohm. Assume that a 15-ampere fuse bounds the output in the interval 0 ≤ I ≤ 15 . Could the power output be increased by replacing the 15-ampere fuse with a 20-ampere fuse? Explain.
Solution Summary: The author explains how a 20-ampere fuse would not increase the power output and the maximum value of P is 72 watt.
Power The formula for the power output P of a battery is
P
=
V
I
−
R
I
2
where V is the electromotive force in volts. R is the resistance in ohms, and I is the current in amperes. Find the current that corresponds to a maximum value of P in a battery for which
V
=
12
volts and
R
=
0.5
ohm. Assume that a 15-ampere fuse bounds the output in the interval
0
≤
I
≤
15
. Could the power output be increased by replacing the 15-ampere fuse with a 20-ampere fuse? Explain.
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