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WorksheetsHULING BANAT CSS4
Total questions: 101
Worksheet time: 17mins
How is an open circuit represented in a circuit diagram?
Closed loop
Straight line
Open loop
Zigzag line
What effect does an open circuit have on the flow of current?
Current increases significantly
Current flows normally
Current fluctuates rapidly
Current is completely blocked
Who conducted this experiment using readily available items such as a basic kite crafted from a large silk handkerchief, a hemp string, and a silk string? Additionally, they possessed a house key, a Leyden jar (a device capable of storing electrical charge for future utilization), and a sharp piece of wire.
Luigi Galvani
Benjamin Franklin
Benjamin Pranklin
Stephen Gray
What is the purpose of the main breaker's amperage rating?
To determine the number of circuits that can be connected to the main breaker
Current flows normallyTo provide information about the manufacturer of the main breaker
Current fluctuates rapidlyTo indicate the maximum current that can pass through the main breaker
Current is completely blocked To control the voltage supplied by the main breaker
What is the purpose of a resistor in an electrical circuit?
To protect against power surges
To control the flow of current
To store and release electrical energy
To regulate the voltage in the circuit
Which of the following statements is highly unlikely to be true?
Resistance is caused by various factors, including the type of material, its dimensions, temperature, and the presence of impurities or defects.
Resistors can be connected in series or parallel to achieve desired resistance values in a circuit.
Resistance, denoted by the symbol "R," is a fundamental property of materials that hinders the flow of electric current.
Resistors are electronic components specifically designed to provide a dynamic resistance value in a circuit.
What is the primary function of a capacitor in an electrical circuit?
To store and release electrical energy
To protect against power surges
To regulate the voltage in the circuit
To generate magnetic fields
What are the three terminals of a bipolar junction transistor?
Gate, Drain, Source
Input, Output, Ground
Base, Collector, Emitter
Anode, Cathode, Gate
Which of the following types of electrical outlets is commonly used in the Philippines?
Type C
Type G
Type A
Type B
Which of the following is true for a PNP transistor?
The base current flows into the transistor
The collector is more positive than the base
The collector current flows out of the transistor
The emitter is more negative than the base
What is the main characteristic of a diode in terms of current flow?
It blocks current completely in both directions.
It amplifies current in one direction.
It allows current to flow in one direction only.
It allows current to flow equally in both directions.
What does the tolerance rating of a resistor indicate?
The resistor's voltage rating
The resistor's manufacturing date
The range within which the actual resistance may vary
The resistor's power rating
What happens to the voltage in a closed circuit?
Voltage fluctuates
Voltage increases
Voltage remains constant
Voltage decreases
What is the unit of measurement for electric current?
Watts (W)
Ohms (Ω)
Amperes (A)
Volts (V)
Which of the following inventions is associated with Thomas Edison?
Phonograph
Electric generator
Radio
Telephone
What is the function of a battery in a circuit?
To provide a power source
To control the resistance
To measure the current
To regulate the voltage
What is the technical name for a three-pronged outlet?
Type B outlet
Type A outlet
Type C outlet
Grounded Outlet
Which of the following experiments conducted by Luigi Galvani in the field of electricity involved an observation with animal tissues?
Examination of animal tissues for electrical charges.
Study of electrical currents through animal tissues.
Investigation of electrical conductivity in animal tissues.
Observation of animal tissues in relation to magnetic fields.
Which component can protect against short circuits?
Switch
Resistor
Fuse
Capacitor
What is the standard voltage supplied by a typical residential electrical outlet in the Philippines?
220 volts
240 Volts
480 Volts
110 Volts
What safety device is used to detect and prevent electric shock?
Circuit breaker
Fuse
GFCI
Relay
What should you do if someone is experiencing electric shock?
Call for help and stay away
Turn off the power source
Give them water
Pull them away immediately
What significant contribution is associated with Michael Faraday?
Development of the steam engine
Discovery of electromagnetic induction
Creation of the internal combustion engine
Invention of the telephone
What does a transformer do?
Increases or decreases voltage
Measures current
Converts DC to AC
Stores electrical energy
What is the purpose of the base terminal in a bipolar junction transistor?
To control the current flow between the collector and emitter
To regulate the voltage in the circuit
To provide mechanical support
To dissipate heat
Which of the following statements is highly unlikely to be false?
The direction of the voltage in direct current is always constant.
The direction of the voltage in alternating current is always constant.
The direction of the current in direct current is always constant.
The direction of the current in alternating current is always constant.
What is the primary function of a capacitor in a DC power supply?
To store large amounts of charge for long periods
To convert AC to DC
To step up or step down voltage
To filter and smooth the output
Which of the following is a recommended safety measure to prevent electric shocks?
Overloading power strips
Touching electrical equipment with wet hands
Using grounded electrical outlets
Using damaged electrical cords
How can an inductor be demagnetized?
By disconnecting it from the circuit
By increasing the voltage across the inductor
By decreasing the current flowing through the inductor
By reversing the polarity of the inductor
How does a diode behave when reverse biased?
It allows current to flow through it
It blocks the flow of current
It generates a magnetic field
It emits light
Which of the following is not a benefit of proper earth grounding?
Minimization of equipment damage during electrical surges
Reduction of energy consumption
Protection against electrical shocks
Prevention of electrical fires
What safety device is commonly used to protect against short circuits in household circuits?
Resistor
Capacitor
Circuit breaker
Transistor
Which of the following statements is highly likely to be true?
Voltage can be step-up or step-down through the use of capacitors.
Batteries, such as those used in portable devices, have a specific voltage rating. Common examples include AA batteries (1.5 volts) and 9-volt batteries.
Voltage is essential for the operation of electrical devices. It powers electronic components, enables the flow of positive electric charge.
In AC circuits, voltage can be constant or variable.
Which of the following technological advancements is associated with Nikola Tesla?
Creation of the transistor
Invention of the radio
Development of the internal combustion engine
Discovery of penicillin
How does earth grounding help protect against electrical shocks?
It isolates electrical devices from the earth
It regulates the voltage supplied to electrical devices
It provides a safe pathway for electrical current to dissipate
It prevents electrical current from flowing to the earth
What is the function of a switch in an electrical circuit?
To break or complete the circuit
To regulate the resistance
To control the voltage
To measure the current
Can a three-pronged device be plugged into a two-pronged outlet using an adapter?
Yes, as long as the ground connection is not necessary.
No, because the plug shape is incompatible.
No, it is not recommended due to safety concerns.
Yes, with the use of a voltage converter.
Which component in a circuit can store and release electrical energy?
Capacitor
Resistor
Diode
Transistor
What is the main difference between a capacitor and a battery?
Capacitors can only be used in AC circuits; batteries can only be used in DC circuits.
Capacitors store energy in an electric field; batteries store energy chemically.
Capacitors are smaller; batteries are larger.
Capacitors provide continuous energy; batteries provide instantaneous energy.
Which safety device automatically shuts off power to a circuit when it detects an electrical fault?
Power Strip
Surge Protector
Circuit Breaker
Extension Cord
Which of the following statements is highly unlikely to be true?
Lower voltage systems like 110 volts may require higher current to deliver the same amount of power as a higher voltage system.
The choice of 110 volts or 220 volts as a standard voltage for a country's power supply depends on historical, technical, and safety considerations.
Appliances and devices designed for use in countries with 110-volt systems are typically labeled for 110-120 volts.
Higher voltage systems, such as 110 volts, can transmit power more efficiently over longer distances with less energy loss compared to lower voltage systems.
What is the role of a capacitor in a filtering circuit?
To smooth out voltage fluctuations
To store energy
To amplify signals
To increase current
Which of the following statements is highly unlikely to be true?
AC allows for the efficient long-distance transmission of electricity, as it can be easily stepped up or down using transformers.
The use of AC in power systems led to the establishment of standard voltage levels, such as 120V or 230V, depending on the country.
The development and promotion of AC as a method for power transmission is credited to Nikola Tesla.
Alternating current is a type of electrical current that constantly changes direction.
Which of the following characteristics make copper an advantageous choice for electrical wiring?
Lightweight
High conductivity
Corrosion
Low cost
Which of the following capacitors is non-polarized?
Tantalum capacitor
Electrolytic capacitor
Ceramic capacitor
Supercapacitor
Can a lightning arrester provide protection against direct lightning strikes to a building?
No, it is ineffective against direct lightning strikes
No, it is designed to minimize the damage caused by direct strikes
Yes, it can completely prevent direct lightning strikes
Yes, but only if the lightning arrester is connected to a lightning rod
Which of the following devices typically require a three-pronged outlet?
Lamps
Mobile phones
Battery-operated toys
Kitchen appliances
What does it mean if an electrical outlet feels warm to the touch?
It needs to be replaced with a new outlet
It is working properly
There is an electrical fault
There is a power surge
How does a lightning arrester work?
It generates a magnetic field that repels lightning strikes
It absorbs the energy of a lightning strike and dissipates it harmlessly
There is an electrical faultIt disconnects the electrical system from the main power source during thunderstorms
It physically intercepts lightning strikes and redirects them away from the protected area
What happens in an open circuit?
The circuit voltage increases
The circuit fails to conduct electricity
The circuit experiences a short circuit
The circuit conducts electricity normally
Which of the following experiments about electricity is associated with Benjamin Franklin?
Study of magnetic fields generated by electrical currents
Investigation of lightning rods and their ability to protect buildings
Examination of electrical charges in animal tissues
Analysis of electrical conductivity in different materials
Which of the following statements is highly unlikely to be false?
Resistors are electronic components specifically designed to provide a dynamic resistance value in a circuit.
Temperature does not affect the resistance of most materials.
The resistance of conductive materials can be maximized by using materials with high conductivity, such as copper or aluminum, which are commonly used in electrical wiring.
Resistance, denoted by the symbol "R," is a fundamental property of materials that hinders the flow of electric current.
What happens when a fault occurs in an electrical system with proper earth grounding?
The fault current is safely directed to the ground
The earth grounding system gets damaged and requires repair
The voltage in the system decreases significantly
The fault current is amplified and spreads throughout the system
What does BJT stand for?
Bipolar Junction Transistor
Basic Junction Transistor
Base Junction Transistor
Binary Junction Transistor
What happens to the current flowing through a resistor when the resistance value is increased?
The current decreases
The current increases
The current fluctuates
The current remains the same
What is the main function of a main breaker in an electrical panel?
To control individual circuits within the electrical system
To regulate the flow of electricity throughout the entire electrical system
To provide a connection point for grounding
To protect against electrical shocks and overcurrents
In which countries are three-pronged outlets commonly used?
United States
Germany
China
United Kingdom
Which of the following components completes a closed circuit?
Diode
Resistor
Capacitor
Battery
What is the unit of electrical resistance?
Watt
Ohm
Ampere
Volt
What is the role of a grounding rod in an earth grounding system?
To provide a safe pathway for lightning strikes
To regulate the voltage supplied to the electrical system
To connect electrical devices to the ground
To monitor the electrical current in the system
How does a transistor amplify a signal?
By reducing the amplitude of the input signal
By blocking the flow of current
By increasing the current or voltage of the input signal
By converting AC signals to DC signals
What is the purpose of a fuse in an electrical circuit?
To provide a path for current
To amplify the current
To store electrical energy
To protect against overcurrent
What effect does a closed circuit have on the flow of current?
Current fluctuates rapidly
Current increases significantly
Current flows normally
Current is completely blocked
How can a short circuit be prevented?
All options are valid
Proper insulation of wires
Avoiding overloading the circuit
Using circuit protection devices
(1) The transmission lines in the Philippines are primarily managed and operated by the National Grid Corporation of the Philippines (NGCP).
(2) The transmission lines in the Philippines face unique challenges due to the country's geography and natural conditions.
(3) The transmission system in the Philippines operates at various voltage levels, including 230 kV (kilovolts), 138 kV, and 69 kV. These high-voltage levels are used to transmit electricity efficiently over long distances.
(4) The Philippines is actively exploring renewable energy sources, such as solar and wind, to diversify its power generation mix and reduce dependence on fossil fuels.
All statements presented are accurate.
Both statement 3 and 4 are valid.
Both statement 2 and 3 are invalid.
Both statement 1 and 2 are valid.
How does a three-pronged outlet help protect against electrical shocks?
It generates a magnetic field that repels electrical currents.
It reduces the flow of electricity in case of a short circuit.
It provides a separate grounding path for excess electricity.
It converts electrical energy into mechanical energy.
Which of the following statements is highly unlikely to be true?
In DC circuits, voltage can be constant or variable.
Voltage can be step-up or step-down through the use of capacitors.
Voltage fluctuations or surges can occur due to various factors such as lightning strikes, power grid instabilities, or equipment malfunctions.
Voltage can be either direct current (DC) or alternating current (AC).
How can a closed circuit be opened?
By removing the battery
By disconnecting a component
All other options are valid
By opening the switch
Which of the following statements accurately describe the use of copper in electricity or appliances? Choose all that apply:
1. Copper is a highly conductive metal, making it an ideal choice for electrical wiring.
2. Copper is often used in motors and transformers due to its excellent electrical conductivity.
3. Copper is a poor conductor of electricity, limiting its use in electrical applications.
4. Copper is resistant to corrosion, making it suitable for long-lasting electrical connections.
5. Copper is a lightweight material, making it preferable for heavy-duty appliances.
Both statement 3 and 5 are invalid.
Both statement 1 and 5 are invalid.
Both statement 4 and 5 are invalid.
Both statement 2 and 3 are invalid.
Which of the following components is used to store electrical energy for a short period?
Capacitor
Inductor
Resistor
Transformer
What is the purpose of the tolerance value in resistor color coding?
To indicate the manufacturing date
To determine the power rating
To define the resistance range within which the actual value may vary
To specify the voltage rating
What is the purpose of a lightning rod?
To attract lightning strikes towards a safe location
To regulate the voltage in an electrical system during thunderstorms
To safely divert lightning currents away from sensitive equipment
To prevent lightning strikes from occurring
What safety feature is commonly found in modern electrical outlets?
Grounding
Tamper resistance
Overload protection
Surge protection
What happens when the main breaker is tripped?
The main breaker automatically resets after a short period of time
Only the circuit connected to the tripped breaker loses power
The entire electrical system loses power
The main breaker needs to be manually reset to restore power
Which of the following should be used to handle electrical appliances or switches with wet hands?
Rubber Gloves
Dry clothes
Metal tongs
Bare hands
What is the purpose of a heat sink in electronic circuits?
To insulate heat
To dissipate heat
To store heat
To generate heat
What does the term reverse bias refer to in a diode?
When the cathode is more positive than the anode
When no current flows through the diode
When the diode emits light
When the anode is more positive than the cathode
Can the amperage rating of a main breaker be increased to accommodate additional electrical load?
No, the amperage rating can only be decreased but not increased
No, the amperage rating is fixed and cannot be modified
Yes, by replacing the main breaker with a higher-rated one
Yes, by installing a sub-panel to handle the additional load
Which of the following types of electrical outlets is commonly used for heavy-duty appliances like air conditioners or electric stoves?
Type C
Type A
Type B
Type N
What is the main difference between NPN and PNP transistors?
Number of terminals
Direction of current flow
Voltage rating
Physical size
What is the unit of measurement for resistance?
Ohms (Ω)
Farads (F)
Volts (V)
Amperes (A)
Which of the following statements accurately describe Aluminum Conductor Steel Reinforced (ACSR)? Choose all that apply:
1. ACSR is a type of conductor commonly used in overhead transmission lines.
2. ACSR combines the properties of aluminum and steel to optimize strength and conductivity.
3. ACSR is lighter in weight compared to pure aluminum conductors.
4. ACSR requires higher maintenance due to its susceptibility to corrosion.
5. ACSR is an environmentally-friendly choice.
Statement 1, 3 and 5 are valid.
Statement 1, 2 and 5 are valid.
All statements presented are accurate.
Statement 1, 4, and 5 are valid.
What is the primary function of a transistor in an electrical circuit?
To protect against power surges
To amplify or switch electronic signals
To store and release electrical energy
To regulate the voltage in the circuit
Which of the following statements is highly likely to be true?
In many countries, including the United States the standard voltage for residential and commercial power supply is 110-120 volts AC at a frequency of 50 Hz.
Higher voltage systems, such as 110 volts, can transmit power more efficiently over longer distances with less energy loss compared to lower voltage systems.
Appliances and devices designed for use in countries with 220-volt systems are typically labeled for 220-260 volts.
In contrast, many countries, including most of Europe, Asia, and Africa, use a standard voltage of 220-240 volts AC at a frequency of 50 Hz.
Which statement best describes a circuit?
A tool for generating electricity
A unit of measurement for resistance
A closed loop of wires and components through which electric current flows
A device used to measure electric current
He declared that electricity was composed of two distinct fluids.
Charles Francis Dufay
Luigi Galvani
Stephen Gray
Benjamin Franklin
What was the significant event that took place in Chicago in 1893, which was lit up by alternating current of George Westinghouse?
New York World's Fair
Paris Exposition
Chicago World's Fair
London International Exhibition
Which of the following statements is highly likely to be true?
Electric current cannot be produced by various sources, including batteries, generators, and solar panels.
The amount of current flowing through a circuit depends on the voltage applied and the resistance of the circuit.
Electric current is the flow of electric charge through an insulator.
Conductors, such as metals, allow electric current to flow easily, while insulators facilitate the flow of current.
What does LED stand for?
Light Emitting Display
Low Energy Diode
Light Emitting Diode
Light Enhancement Diode
How does a diode behave when forward biased?
It allows current to flow through it.
It blocks the flow of current.
It emits light.
It generates a magnetic field.
Which of the following statements about closed circuits is true?
Closed circuits are not used in any electrical systems.
Closed circuits can be used in both DC and AC systems.
Closed circuits are only used in alternating current (AC) systems.
Closed circuits are only used in direct current (DC) systems.
Which of the following components can cause an open circuit?
Diode
Break in the wire
Capacitor
Resistor
In an NPN transistor, which way does the current flow in the emitter?
Inwards
Outwards
Both directions
No current flow
In which of the following applications is copper commonly used due to its excellent electrical conductivity?
Plastic insulation
Lighting fixtures
Microchip
Battery cells
Who is credited with the development and promotion of alternating current (AC) as a viable method for electrical power transmission?
Thomas Edison
Benjamin Franklin
Alexander Graham Bell
Nikola Tesla
Which of the following best describes an electric circuit?
A device that converts electrical energy into mechanical energy.
A material that conducts electricity with low resistance.
A closed loop or pathway through which electric current flows.
A device that stores electrical charge for later use.
Which of the following statements about main breakers is true?
Main breakers protect against electrical shorts but not overloads.
Main breakers can be used as on/off switches for the electrical system.
Main breakers are not required by electrical codes and regulations.
Main breakers are only found in commercial buildings.
Which of the following materials is commonly used as a conductor in electrical circuits?
Glass
Copper
Rubber
Plastic
What should you do if you notice frayed or damaged electrical cords?
Repair them yourself using tape
Use them with caution and avoid touching the damaged area
Replace them with new cords
Continue using them until they stop working
What is the primary function of a diode in an electrical circuit?
To store and release electrical energy
To protect against power surges
To control the direction of current flow
To regulate the voltage in the circuit
In a 4-band resistor: What does the fourth color band on a resistor represent?
Temperature coefficient
Voltage rating
Power rating
Tolerance
