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Physics & Astronomy
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Fundamentals of Physics Study Set 2
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Fundamentals of Physics Study Set 2
Physics & Astronomy
Quiz 26 :
Current and Resistance
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Quiz 26 :
Current and Resistance
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A car battery is rated at 80 A
h.An ampere-hour is a unit of:
Free
Multiple Choice
Q01
Answer:
Answer:
D
Current has units:
Free
Multiple Choice
Q02
Answer:
Answer:
B
Current has units:
Free
Multiple Choice
Q03
Answer:
Answer:
B
Current is a measure of:
Multiple Choice
Q04
Answer:
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A 60-watt light bulb carries a current of 0.5 ampere.The total charge passing through it in one hour is:
Multiple Choice
Q05
Answer:
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A 10-ohm resistor has a constant current.If 1200 C of charge flow through it in 4 minutes what is the value of the current?
Multiple Choice
Q06
Answer:
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Current in a conductor is normally due to:
Multiple Choice
Q07
Answer:
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This figure shows a junction.What is true of the currents?
Multiple Choice
Q08
Answer:
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In schematic diagrams, currents are indicated using arrows.What do the arrows indicate?
Multiple Choice
Q09
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Conduction electrons move to the right in a certain wire.This indicates that:
Multiple Choice
Q10
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If is the current density and is a vector element of area then the integral over an area represents:
Multiple Choice
Q11
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Two wires made of different materials have the same uniform current density.They carry the same current only if:
Multiple Choice
Q12
Answer:
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A wire with a length of 150 m and a radius of 0.15 mm carries a current with a uniform current density of 2.8
10
7
A/m
2
.The current is:
Multiple Choice
Q13
Answer:
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In a conductor carrying a current we expect the electron drift speed to be:
Multiple Choice
Q14
Answer:
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The current is zero in a conductor when no potential difference is applied because:
Multiple Choice
Q15
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The current density is the same in two wires.Wire A has twice the free electron concentration of wire B.The drift speed of electrons in A is:
Multiple Choice
Q16
Answer:
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Copper contains 8.4
10
28
free electrons per cubic meter.A copper wire of cross-sectional area 7.4
10
-7
m
2
carries a current of 1 A.The electron drift speed is approximately:
Multiple Choice
Q17
Answer:
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The units of resistivity are:
Multiple Choice
Q18
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If the potential difference across a resistor is doubled:
Multiple Choice
Q19
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A current of 0.5 ampere exists in a 60-ohm lamp.The applied potential difference is:
Multiple Choice
Q20
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