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.
A 20 foot ladder rests on level ground; its head (top) is against a vertical wall. The bottom of the ladder begins by being 12 feet from the wall but begins moving away at the rate of 0.1 feet per second. At what rate is the top of the ladder slipping down the wall? You may use a calculator.
Explain the focus and reasons for establishment of 12.4.1(root test) and 12.4.2(ratio test)
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