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WorksheetsDC & capacitor
Total questions: 35
Worksheet time: 22mins
What is current measured in?
Ω (Ohms)
V (Volts)
A (Ampere)
W (Watts)
Define electric current.
It is the work done by the source in driving charges around a complete circuit.
It is a measure of the rate of flow of electric charge through a given cross sectional area of a conductor.
It is the work done by the source in driving a unit charge around a complete circuit.
It is a measure of the flow of electric charge through a given cross sectional area of a conductor.
What type of quantity does the current belongs to?
a base and vector quantities
a base and scalar quantities
a derived and vector quantities
a derived and scalar quantities
From the equation, we know that the resistance of a conductor is independent on..?
length of conductor
cross sectional area
type of material
volume of the wire
State Ohm's Law.
the potential difference across a metallic conductor is proportional to the resistance flowing through it if its temperature is constant.
the resistance across a metallic conductor is proportional to the current flowing through it if its temperature is constant.
the potential difference across a metallic conductor is proportional to the current flowing through it if its temperature is constant.
the current across a metallic conductor is proportional to the potential difference flowing through it if its temperature is constant.
Which equation defines Ohm's Law?
V=IV
R=VI
I=VR
V=IR
Quantity of charge can be measured in
time (s)
Ampere (A)
coulombs (C)
Joule (J)
This is an example of a _______ circuit
open
series
parallel
square
This is an example of a ______ circuit
Series
Parallel
Open
Dihexihedral
Resistivity dependent on which of the following?
shape of the wire
length of the wire
cross-sectional area of the wire
type of metal
Which of the following statement are CORRECT about the FIGURE 17.2?
Charge across C2 and C3 are same.
Voltage across C1 and C2 are same.
Total capacitance is 2.25 μ F
Total voltage across C2 and C3 are 16 V
In the circuit shown, capacitor C is initially uncharged. At time t = 0, the switch S is closed.
Which of the following statements is correct regarding the charging of the capacitor?
Immediately after S is closed, the current in the circuit rise slowly until a maximum
value.
Immediately after S is closed, the current in the circuit is a maximum, the current then
decreases.
The capacitor is fully charged after a time t = CR
The current in the circuit at any time only depends on the resistance R and is
independent of the capacitance C.
Capacitor is a device used to__________
store electrical energy
vary the resistance
store magnetic energy
dissipate energy
The capacitance C is charged through a resistor R. The time constant of the charging circuit is given by
C/R
1/RC
RC
R/C
Unit of capacitance is___________
Volts
Farad
Henry
Newton
During charging a capacitor variation of potential V of the capacitor with time t is shown as
Capacitors charge and discharge in __________ manner.
Linear
Constant
Square
Exponential
Which among the following equations is incorrect?
Q=CV
Q=C/V
V=Q/C
C=Q/V
What happens to the capacitor when the capacitor voltage is equal to the source voltage?
The charging phase of the capacitor is over
The discharging phase of the capacitor is over
The capacitor is switched off
The capacitor is switched on
When will be capacitors fully charged
When voltage is zero
When the supply voltage is equal to the capacitor voltage
When voltage is infinity
When capacitor voltage is equal to half the supply voltage
During charging a capacitor through a resistor
the current in the circuit increases linearly with time
the current in the circuit decreases linearly with time
the current in the circuit increases exponentially with time
the current in the circuit decreases exponentially with time
During discharging a capacitor through a resistor
the current in the circuit increases linearly with time
the current in the circuit decreases linearly with time
the current in the circuit increases exponentially with time
the current in the circuit decreases exponentially with time
Which is the Q vs t graph for the charging process of a capacitor?
a
b
neither
both
If capacitors are connected in parallel, then potential difference across each capacitor is
same
zero
different
infinite
The quantity RC that appears in the exponent for all equations in the charging and discharging process is called _______.
time lapse
time instant
time constant
What unit is used to measure resistance?
Ohms
Omega
Volts
Amps
If the Voltage is increased and the resistance stays the same, Current will
Increase
Decrease
Stay the same
none of above
If the Voltage stays the same and Resistance is increased, Current will
Increase
Decrease
Stay the same
none of above
The unit of resistivity is
Ω/m
Ω/m2
Ωm
Ωm2
Which factor does affect resistivity?
Length
Mass
Cross-sectional area
Temperature
