The diameter of a 12-gauge copper wire is 0.081 in. The maximum safe current it can carry (in order to prevent fire danger in building construction) is 20 A.
At this current, what is the drift velocity of the electrons? The number of electron carriers in 1.0 cm3 of copper is 8.5 1022 and e = 1.60 10-19 C. A) 0.044 mm/s
B) 0.44 mm/s
C) 0.44 cm/s
D) 0.44 m/s
E) 4.4 cm/s
Question 2
At what temperature would the root-mean-square speed (thermal speed) of oxygen molecules be 13.0 m/s? Assume that oxygen approximates an ideal gas. The mass of one O2 molecule is 5.312 x 10-26 kg. The Boltzmann constant is 1.38 10-23 J/K.
A) 0.217 K B) 0.0666 K C) 1800 K D) 5410 K
Wire Fox Terrier
copper
Marianne Nicholson, Kwakwaka'wakw pictograph of a copper on a cliff near Kingcome.
An example of an EHR screen used to order a laboratory test.
Average Hourly Earnings of U.S. Workers in Current and Constant Dollars
A wire wound electrical heater is used to warm the intake air on some diesel engines