WorksheetsElectric Current & DC Circuits
Total questions: 20
Worksheet time: 41mins
A material which allows electrical current to pass through is called ________________.
An insulator
A cell
A switch
A conductor
If the current in a copper wire increases, it is due to _____________.
An increase in the number of electron
An increase in the electron drift speed
An increase in the cross sectional area of the wire
A decrease in the electron drift speed
Directions of drift velocity of electrons and electric field are
In same direction
Opposite to each other
Fluctuated
None of above
Drift velocity is
The average velocity with which the electrons moves towards the positive terminal of the battery.
Velocity of an electron in a conductor
Average thermal velocity
The average velocity with which the electrons moves towards the negative terminal of the battery.
The total charge, Q flowing the area per unit time is defined as ?
Current
Capacitance
Coulomb
Potential difference
Electrical current has direction. However, it not considered a vector quantity. WHY?
Because current does not obey the laws of vector addition
Because charge is Quantized
Because conventional direction of current is only virtual
Because current obeys Kirchhoff Laws
What is the scientific formula for ohm's law?
V=IR
I=VR
R=IV
None of the above
Based on the graph, which of the following would be true regarding the relationship of voltage and current?
As voltage increases, current decreases.
Voltage will not affect current.
As voltage decreases, current increases.
As voltage increases, current also increases.
A resistor is connected in series with a battery in a DC circuit. When the voltage of the battery is increased, the resistance of the resistor will
Increase linearly
Decrease
Stay the same
Increase exponentially
Resistivity
is an ability to oppose current
relies on dimensions of the material
inversely proportional to resistance
a property of the material
The unit of resistivity is
Ω/m
Ω/m2
Ω.m
Ω.m2
What happens to the resistance of a circuit when the temperature is increased?
Increases
decreases
stay the same
vary randomly
The equation for a material with circular cross sectional area is A=
πr2
πr
2πd2
πr3
Which change decreases the resistance of a piece
of copper wire?
increasing the wire‛s length
increasing the wire‛s resistivity
decreasing the wire‛s length
decreasing the wire‛s diameter
Factor which does not affect the resistance
type of materials
length of material
mass of material
cross-sectional area of material
