WorksheetsEP025 Topic 2: Capacitor & Dielectrics
Total questions: 20
Worksheet time: 11mins
What is a capacitor?
A device for storing energy.
A device for storing p.d.
A device for storing charge.
A device for storing capacitance.
Capacitance is measured in___________
Coulombs
Farads
Hz
Volts
Charge is measured in_________
Coulombs
Farads
Hz
Volts
When 3 capacitors are arranged in series , the equivalent capacitance C is
Ceq = C1 + C2 + C3
1/Ceq = 1/C1 + 1/C2 + 1/C3
Ceq = QV1 + QV2 + QV3
Ceq = CR1 + CR2 + CR3
When 3 capacitors are arranged in parallel , the equivalent capacitance is
Ceq = C1 + C2 + C3
Ceq = 1/C1 + 1/C2 + 1/C3
C = QV1 + QV2 + QV3
1/Ceq = 1/C1 + 1/C2 + 1/C3
How is the capacitance of a parallel-plate capacitor affected by the potential difference across the capacitor ?
C depend on the potential difference across the capacitor
C does not depend on the potential difference across the capacitor
C partially depend on the potential difference across the capacitor
C sometime depend on the potential difference across the capacitor
How is the capacitance of a parallel-plate capacitor affected by the area of each plate?
C is directly proportional to the area A of each plate
C is inversely proportional to the area A of each plate
C is partially proportional to the area A of each plate
C is fully proportional to the area A of each plate
How is the capacitance of a parallel-plate capacitor affected by filling the space between the plates with an insulator ?
C stable when the space between the plates is filled with an insulator, εr >1
C reduces when the space between the plates is filled with an insulator, εr >1
C increases when the space between the plates is filled with an insulator, εr >1
C fluctuate when the space between the plates is filled with an insulator, εr >1
εr ,ε, ε0 are related to each other according to the following equation:
εr = ε / ε0
εr = ε0 / ε
εr = ε × ε0
ε0 = εr / ε
In RC circuit, and when charging the capacitor, the time constant (τ) is the time needed for the charge of the capacitor to reach ----------- of its maximum charge.
50%
63%
86%
37%
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
As you charge up a capacitor, what happens to the current through it
Increases
Decreases
Stays the same
Fluctuates
Which is the Q vs t graph for the charging process of a capacitor?
a
b
neither
both
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
What happens to the charge in a capacitor during the discharging process?
Increases over time
Decreases over time
Remains the same
I dont know
The energy stored in the capacitor can be find by using this equation EXCEPT
1/2QV
1/2Q2/C
1/2CV2
1/2RC2
