Physics, 21.01.2020 13:31 klslaughter07
If a resistor of r ohms is connected across a battery of e colts with internal resistance r ohms, then the power (in watts) in the external resistor is \[p = \frac{e^2r}{(r+r)^2}\]
if e and r are fixed but r varies, what is the maximum value of the power?
Answers: 1
Physics, 21.06.2019 20:20
Copper has free electrons per cubic meter. a 71.0-cm length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 a of current. (a) how much time does it take for an electron to travel the length of the wire? (b) repeat part (a) for 6-gauge copper wire (diameter 4.12 mm) of the same length that carries the same current. (c) generally speaking, how does changing the diameter of a wire that carries a given amount of current affect the drift velocity of the electrons in the wire?
Answers: 2
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Answers: 1
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