Electric voltage, also known as electric potential difference, is the measure of the electric potential energy per unit charge between two points in an electrical field. It represents the force that drives electric charges to flow, creating an electric current.
Voltage is measured in volts (V), named after Alessandro Volta, and is calculated as the work done per unit charge to move an electron between two points. For example, in a simple circuit, voltage is provided by a battery or power source, which creates a potential difference that pushes electrons through a conductor.
Key concepts include:
Potential Difference: The difference in electric potential between two points, which causes current to flow. For instance, a 1.5V battery has a potential difference of 1.5 volts between its positive and negative terminals.
Sources of Voltage: Voltage can be generated through chemical reactions (batteries), electromagnetic induction (generators), or photovoltaic effects (solar cells).
Ohm’s Law: Voltage (V) is related to current (I) and resistance (R) by the formula V = I × R, showing how voltage influences the flow of electricity.
Voltage plays a crucial role in everyday applications, such as powering household appliances, electronics, and lighting. It is essential for transmitting energy over long distances in power grids, where high voltages reduce energy loss.
Table of contents
- Part 1: OnlineExamMaker AI quiz generator – Save time and efforts
- Part 2: 20 electric voltage quiz questions & answers
- Part 3: OnlineExamMaker AI Question Generator: Generate questions for any topic
Part 1: OnlineExamMaker AI quiz generator – Save time and efforts
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Part 2: 20 electric voltage quiz questions & answers
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Question 1:
What is the unit of electric voltage?
A. Ampere
B. Ohm
C. Volt
D. Watt
Answer: C
Explanation: The unit of electric voltage is the volt, which measures the potential difference between two points in an electrical circuit.
Question 2:
In a simple circuit, what does voltage represent?
A. The flow of electric charge
B. The opposition to current flow
C. The potential difference that drives current
D. The rate of energy consumption
Answer: C
Explanation: Voltage represents the potential difference that provides the energy to move electric charges through a circuit.
Question 3:
According to Ohm’s Law, what is the relationship between voltage (V), current (I), and resistance (R)?
A. V = I + R
B. V = I × R
C. V = I / R
D. V = R / I
Answer: B
Explanation: Ohm’s Law states that voltage equals current multiplied by resistance, expressed as V = I × R.
Question 4:
What happens to the voltage in a series circuit when more resistors are added?
A. It increases
B. It decreases
C. It remains the same
D. It depends on the current
Answer: C
Explanation: In a series circuit, the total voltage supplied by the source is divided among the resistors, but the source voltage itself remains the same.
Question 5:
Which of the following is a common source of direct current (DC) voltage?
A. Household wall outlets
B. Batteries
C. Power generators
D. Transformers
Answer: B
Explanation: Batteries provide a steady direct current voltage, unlike alternating current sources.
Question 6:
What is the voltage rating typically found on a standard AA battery?
A. 1.5 volts
B. 9 volts
C. 12 volts
D. 120 volts
Answer: A
Explanation: A standard AA battery has a nominal voltage of 1.5 volts.
Question 7:
In a parallel circuit, how is voltage distributed across components?
A. It varies for each component
B. It is the same for each component
C. It adds up for each component
D. It decreases with each component
Answer: B
Explanation: In a parallel circuit, the voltage across each branch is equal to the source voltage.
Question 8:
What is the purpose of a voltage regulator in an electronic device?
A. To increase voltage
B. To maintain a constant voltage
C. To measure voltage
D. To store voltage
Answer: B
Explanation: A voltage regulator ensures that the output voltage remains stable despite variations in input voltage or load.
Question 9:
Which law describes the voltage around a closed loop in a circuit?
A. Kirchhoff’s Current Law
B. Kirchhoff’s Voltage Law
C. Ohm’s Law
D. Faraday’s Law
Answer: B
Explanation: Kirchhoff’s Voltage Law states that the sum of all voltages around a closed loop in a circuit equals zero.
Question 10:
What is the typical voltage of a standard electrical outlet in the United States?
A. 110 volts
B. 220 volts
C. 240 volts
D. 12 volts
Answer: A
Explanation: In the United States, standard outlets provide approximately 110-120 volts of alternating current.
Question 11:
How does increasing the voltage affect the current in a circuit with fixed resistance?
A. Current decreases
B. Current increases
C. Current remains the same
D. Current stops flowing
Answer: B
Explanation: From Ohm’s Law (V = I × R), increasing voltage while keeping resistance constant increases the current.
Question 12:
What type of voltage is produced by a generator in a power plant?
A. Direct current (DC)
B. Alternating current (AC)
C. Pulsating current
D. Static voltage
Answer: B
Explanation: Power plant generators produce alternating current voltage, which alternates direction periodically.
Question 13:
In a voltage divider circuit, how is the output voltage determined?
A. By the total resistance only
B. By the ratio of resistors
C. By the current source
D. By the capacitor value
Answer: B
Explanation: The output voltage in a voltage divider is determined by the ratio of the two resistors in the circuit.
Question 14:
What is the voltage drop across a resistor if the current is 2 amperes and the resistance is 5 ohms?
A. 2.5 volts
B. 5 volts
C. 7 volts
D. 10 volts
Answer: D
Explanation: Using Ohm’s Law, V = I × R, so voltage drop = 2 A × 5 Ω = 10 volts.
Question 15:
Which device is used to measure electric voltage in a circuit?
A. Ammeter
B. Ohmmeter
C. Voltmeter
D. Wattmeter
Answer: C
Explanation: A voltmeter is specifically designed to measure the potential difference or voltage between two points.
Question 16:
What is the effect of a short circuit on voltage?
A. Voltage increases
B. Voltage decreases to zero
C. Voltage remains constant
D. Voltage fluctuates
Answer: B
Explanation: In a short circuit, the voltage across the load drops to nearly zero because of the low resistance path.
Question 17:
In transformers, how is voltage stepped up or down?
A. By changing the current
B. By the ratio of primary to secondary windings
C. By adding resistors
D. By using capacitors
Answer: B
Explanation: Transformers change voltage based on the turns ratio between the primary and secondary coils.
Question 18:
What is the maximum safe voltage for human contact without serious risk?
A. 12 volts
B. 50 volts
C. 120 volts
D. 240 volts
Answer: B
Explanation: Generally, voltages below 50 volts are considered safe for human contact to avoid electric shock.
Question 19:
How does voltage behave in an open circuit?
A. It is zero
B. It is equal to the source voltage
C. It varies randomly
D. It increases over time
Answer: B
Explanation: In an open circuit, no current flows, so the voltage across the open points is equal to the source voltage.
Question 20:
What is peak voltage in an AC circuit?
A. The average voltage
B. The maximum voltage from zero
C. The minimum voltage
D. The effective voltage
Answer: B
Explanation: Peak voltage in AC is the highest value that the voltage reaches in one cycle from the zero point.
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