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Worksheets4th Quarter Summative Assessment
Total questions: 20
Worksheet time: 20mins
A capacitor is a device used to __________.
dissipate energy
dissipate power
store magnetic energy
store electrical energy
What is the value of the capacitance of a capacitor which has a voltage of 5 V and has a 10 C of charge?
2 F
5 F
15 F
50 F
Which of the following describes the electric potential inside a parallel-plate capacitor?
It is constant.
It increases linearly from the negative to the positive plate.
It decreases linearly from the negative to the positive plate.
It decreases inversely with distance from the negative plate.
Which of the following describes a series connection of capacitors?
Total voltage is equal to the voltage drop in each capacitor.
The total charge is equal to the sum of the individual charge.
The equivalent capacitance is equal to the sum of the individual capacitance.
The reciprocal of the equivalent capacitance is equal to the sum of the reciprocal of individual capacitance.
What is the capacitance in the network if two capacitors 2 μF and 3 μF are connected parallel?
6 μF
5 μF
1.5 μF
1 μF
How much energy is stored in a 3 μF capacitor charged to 6 V?
18 μJ
27 μJ
54 μJ
108 μJ
Which of the following is the best use of capacitor in our daily life?
used as switches in a digital circuit
used in television systems as phase detectors
used in a heater and many more heating appliances
used to measure fuel levels and air humidity as sensors
Which of the following describes a parallel connection of capacitors?
The total charge is equal to the individual charges.
Total voltage is equal to the sum of the voltage drop in each capacitor.
The equivalent capacitance is equal to the sum of the individual capacitance.
The reciprocal of the equivalent capacitance is equal to the sum of the reciprocal individual capacitance.
What is the role of dielectric in a capacitor?
to decrease the capacitance
to increase the electric field
to avoid touching two parallel plates
to have a conducting material between the two parallel plates
How is the capacitance affected when inserted a dielectric material in a capacitor?
The capacitance increases.
The capacitance decreases.
The capacitance remains the same.
The capacitance increases and decreases.
Why copper wires instead of nichrome wires were used for electrical wirings?
Copper wire has a lower resistivity with greater resistance.
Copper wire has a higher conductivity with lesser resistance.
Nichrome wire has a lower resistivity with greater resistance.
Nichrome wire has a higher conductivity with lesser resistance.
Which of the following statements best describes the importance of conductivity and resistivity of a metallic conductor?
Conductivity and resistivity cannot help to avoid short circuits and overloading.
Conductivity and resistivity are just characteristics of a metallic conductor.
Conductivity and resistivity are important to lessen the cost of electrical wirings.
Conductivity and resistivity are important to avoid fire at home.
Which of the following statement is correct about Ohm’s Law?
The voltage V is inversely proportional to the current I when the resistance R is constant.
The voltage V is directly proportional to the current I when the resistance R is constant.
The resistance R is inversely proportional to the voltage V when the current I is constant.
The resistance R is directly proportional to the current I when the voltage V is constant.
From the formula R = ρ L/A, how is the resistance affected by the increase of the length of wire?
The longer the wire, the lesser the resistance.
The longer the wire, the greater the resistance.
The shorter the wire, the greater the resistance.
The length of the wire does not affect the resistance of a material.
What is the difference between ohmic and non-ohmic materials?
Ohmic materials are those that do not obey Ohm’s Law while non-ohmic materials obeyed Ohm’s Law.
Ohmic materials are those that obeyed Ohm’s Law while non-ohmic materials do not obey Ohm’s Law.
Ohmic materials have a curve or non-linear while non-ohmic have straight or linear trends for V-I curves.
Diode and semiconductors are ohmic materials while metals, conductors, copper wire are non-ohmic materials.
Which of the following shows safety tips for electrical devices?
Short or long wire does not affect the resistance of a material in the electrical devices
The thinner the wire or smaller the diameter, the better the efficiency of the electrical devices.
The length and cross-sectional area of a wire should be observed in using the electrical devices.
The current, voltage and resistance of a wire should not be observed in using electrical devices.
How important is Ohm’s Law to electrical devices?
It gives information about different kinds of wire.
It avoids electrical devices from short circuits and overloading.
Because it helps to calculate the current, voltage, and resistance.
You will know the relationship between the current, voltage, and resistance.
The energy dissipated in a resistor is converted to __________.
current
heat
resistance
voltage
Three resistors, 10 Ω, 20 Ω, and 30 Ω, are connected in series. What is the equivalent resistance?
0.183 Ω
1.00 Ω
5.45 Ω
60.0 Ω
Three resistors, 10 Ω, 20 Ω, and 30 Ω, are connected in parallel. What is the equivalent resistance?
0.183 Ω
1.00 Ω
5.45 Ω
60.0 Ω
