Current And Voltage In Circuits Quiz
We welcome you all to this current and voltage in circuits quiz! Do you think you are well versed on the topic of current & voltage? If you said yes, wouldn't it be fun to take a quiz and test your knowledge? Are you confident that you'll ace this quiz in no time? Let's see you give it a try! Remember, all the questions are compulsory; therefore, read all the questions very carefully. Experts carefully curated all the questions in the quiz, so you can use this quiz as a fun way to prepare for your examinations. Good Luck!
- 1.
What is the basic unit of voltage?
- A.
Watts
- B.
Volts
- C.
Coulombs
- D.
Amperes
Correct Answer
B. VoltsExplanation
Voltage is the measure of electric potential difference between two points in an electrical circuit. It represents the force that drives electric current. The basic unit of voltage is the volt, which is named after the Italian physicist Alessandro Volta. Watts, coulombs, and amperes are all related to electricity, but they are not the basic unit of voltage.Rate this question:
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- 2.
How should a voltmeter be placed in the circuit?
- A.
In series
- B.
In parallel
- C.
Below the circuit
- D.
Upside down of the circuit
Correct Answer
B. In parallelExplanation
A voltmeter should be placed in parallel with the circuit because it measures the potential difference across a component or set of components. Placing it in parallel ensures that it does not affect the circuit's current flow, as it has a high resistance and does not draw significant current. This allows accurate measurement of the voltage without altering the circuit's behavior.Rate this question:
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- 3.
How should one place an ammeter in a circuit?
- A.
In series
- B.
In parallel
- C.
Above the circuit
- D.
Upside down
Correct Answer
A. In seriesExplanation
An ammeter should be placed in series in a circuit. Placing it in series means that the ammeter is connected in line with the current flow, allowing it to measure the current passing through the circuit. This is important because an ammeter needs to be part of the current path in order to accurately measure the current. Placing it in parallel would create a short circuit, disrupting the flow of current and giving inaccurate readings. Placing it above the circuit or upside down would not allow the ammeter to be part of the current path, rendering it ineffective.Rate this question:
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- 4.
What is the basic unit of an electric current?
- A.
Coulombs
- B.
Ohms
- C.
Volts
- D.
Amperes
Correct Answer
D. AmperesExplanation
The basic unit of an electric current is Amperes. Amperes measure the rate of flow of electric charge in a circuit. It represents the number of electrons passing through a point in a circuit per second. Coulombs represent the quantity of electric charge, ohms represent the resistance, and volts represent the electric potential difference. Therefore, Amperes is the correct answer as it specifically measures the current flow.Rate this question:
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- 5.
If the two resistors are in parallel with a voltage source. What happens to their voltages?
- A.
One has full voltage, the other has none
- B.
Voltage across both resistors is the same as the source.
- C.
The voltage across both resistors is half the voltage of the source
- D.
None of the above
Correct Answer
B. Voltage across both resistors is the same as the source.Explanation
When two resistors are connected in parallel with a voltage source, each resistor is directly connected across the same two points, which means they both experience the full voltage provided by the source. This is a fundamental property of parallel circuits, where the voltage across each parallel branch is identical to the voltage of the source, regardless of the values of the resistors.Rate this question:
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- 6.
A resistor has 5 volts and a resistance of 15 ohms. Can you calculate the power consumed?
- A.
2.5 watts
- B.
55 watts
- C.
3 watts
- D.
1.67 watts
Correct Answer
D. 1.67 wattsExplanation
The power consumed by a resistor can be calculated using the formula P = V^2/R, where P is the power, V is the voltage, and R is the resistance. In this case, the voltage is given as 5 volts and the resistance is given as 15 ohms. Plugging these values into the formula, we get P = (5^2)/15 = 25/15 = 1.67 watts.Rate this question:
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- 7.
A graph of plot voltage vs. current in a circuit is plotted, and a linear line is obtained. What is the significance of the slope?
- A.
Resistance
- B.
Current
- C.
Power
- D.
None of the above
Correct Answer
A. ResistanceExplanation
The slope of the linear line in a voltage vs. current graph represents the resistance in the circuit. Resistance is a measure of how much a circuit impedes the flow of current. A steeper slope indicates a higher resistance, while a shallower slope indicates a lower resistance. Therefore, the significance of the slope in this case is that it provides information about the resistance in the circuit.Rate this question:
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- 8.
A resistor is seen to be consuming 5 watts, and the current flowing through it is 10 amps. What is its voltage?
- A.
0.5V
- B.
5V
- C.
15V
- D.
20V
Correct Answer
A. 0.5VExplanation
The power consumed by a resistor can be calculated using the formula P = IV, where P is power, I is current, and V is voltage. In this case, the power consumed is given as 5 watts and the current flowing through the resistor is given as 10 amps. By rearranging the formula, we can solve for voltage: V = P/I. Plugging in the values, we get V = 5 watts / 10 amps = 0.5 volts.Rate this question:
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- 9.
A resistor is 10 volts across it and has a current of 4 amps going through it. Calculate the resistance.
- A.
2.5 ohm
- B.
88 ohm
- C.
100 ohm
Correct Answer
A. 2.5 ohmExplanation
The resistance can be calculated using Ohm's Law, which states that resistance (R) is equal to voltage (V) divided by current (I). In this case, the voltage across the resistor is 10 volts and the current going through it is 4 amps. Therefore, the resistance is calculated as 10 volts divided by 4 amps, which equals 2.5 ohms.Rate this question:
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- 10.
A current of 3 amperes flows through the resistor of 1-ohm resistor. What is voltage?
- A.
3V
- B.
30V
- C.
300V
- D.
3000V
Correct Answer
A. 3VExplanation
The voltage can be calculated using Ohm's Law, which states that voltage (V) is equal to current (I) multiplied by resistance (R). In this case, the current is given as 3 amperes and the resistance is given as 1 ohm. Therefore, the voltage can be calculated as 3V.Rate this question:
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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
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Current Version
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Aug 26, 2024Quiz Edited by
ProProfs Editorial Team -
Nov 15, 2022Quiz Created by
Tanya Mishra
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