
Current, Resistance, and DC Circuits
Authored by Zachary Jud
Physics
12th Grade - University
Used 24+ times

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9 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A piece of copper wire 1 millimeter in diameter has a current density of 7 A/m2. Calculate the current in the wire.
2.20 A
5.50 μA
7.00 mA
22.0 μA
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
You measure the resistance of a piece of wire as 7.89 mΩ. It has a diameter of 1.2 centimeters and a length of 30 centimeters. Calculate the resistivity of the wire.
2.97 mΩ⋅m
11.8 mΩ⋅m
119 mΩ⋅m
24.8 Ω⋅m
3.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Gold has a carrier density of 5.9(1028) m-3. A current of 20 mA flows through a gold wire with diameter 2.5 millimeters. Calculate the electron drift velocity in the wire.
1.08(10-7) m/s
4.32(10-7) m/s
2.70(10-10) m/s
1.08(1049) m/s
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Aluminum has a carrier density of 6.0(1028) m-3. Calculate the charge density of aluminum.
4.8(106) m-3
9.60(10-19) m-3
9.60(109) m-3
4.8(109) m-3
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A 220 Ω resistor has a voltage of 3.3 V across it. Calculate the current through the resistor.
30 mA
15 mA
15 A
45 mA
6.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
A 220 Ω resistor has a voltage of 3.3 V across it. Calculate the power dissipated by the resistor.
730 mW
495 W
49.5 mW
3.3 W
7.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Calculate the current through the resistors in the circuit above.
9.09 mA
3.22 mA
7.44 mA
6.68 mA
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