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A two terminal black box contains one of the R-L-C elements. When the black box is connected to a 220 V ac supply, the current through the source is I. When a capacitance of 0.1 F is inserted in series between the source and the box, the current through the source is 2I The element is
- a)a resistance
- b)an inductance
- c)a capacitance
- d)it is not possible to determine the element
Correct answer is option 'B'. Can you explain this answer?
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A two terminal black box contains one of the R-L-C elements. When the ...
As current is increased therefore, new impedance should reduce. If the unknown element will be inductive, the new impedance will be (XL- XC) Ω, so that the new value of current will increase.
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A two terminal black box contains one of the R-L-C elements. When the ...
Explanation:
To solve this problem, let's analyze the behavior of the circuit when the capacitance is inserted in series.
1. Initial Circuit:
When the black box is connected to a 220V AC supply, the current through the source is I. This means that the black box contains an element that allows the flow of current in the circuit.
2. Circuit with Series Capacitance:
When a capacitance of 0.1 F is inserted in series between the source and the box, the current through the source is 2I. This indicates that the current has increased in magnitude when the capacitance is added.
3. Behavior of an Inductor and Capacitor:
To understand why the current increases when a capacitance is added, we need to consider the behavior of inductors and capacitors in AC circuits.
- Inductors: In an AC circuit, the current lags the voltage in an inductor. When the voltage across an inductor changes, the inductor opposes the change by inducing a voltage in the opposite direction. This causes the current to increase gradually.
- Capacitors: In an AC circuit, the current leads the voltage in a capacitor. When the voltage across a capacitor changes, the capacitor tries to maintain the current flow by charging or discharging. This causes the current to increase rapidly.
4. Conclusion:
Based on the information given, when the capacitance is added in series and the current through the source increases, it suggests that the black box element is an inductance (L). The inductor causes the current to lag the voltage, resulting in a lower current magnitude.
Therefore, the correct answer is option 'B' - an inductance.
To solve this problem, let's analyze the behavior of the circuit when the capacitance is inserted in series.
1. Initial Circuit:
When the black box is connected to a 220V AC supply, the current through the source is I. This means that the black box contains an element that allows the flow of current in the circuit.
2. Circuit with Series Capacitance:
When a capacitance of 0.1 F is inserted in series between the source and the box, the current through the source is 2I. This indicates that the current has increased in magnitude when the capacitance is added.
3. Behavior of an Inductor and Capacitor:
To understand why the current increases when a capacitance is added, we need to consider the behavior of inductors and capacitors in AC circuits.
- Inductors: In an AC circuit, the current lags the voltage in an inductor. When the voltage across an inductor changes, the inductor opposes the change by inducing a voltage in the opposite direction. This causes the current to increase gradually.
- Capacitors: In an AC circuit, the current leads the voltage in a capacitor. When the voltage across a capacitor changes, the capacitor tries to maintain the current flow by charging or discharging. This causes the current to increase rapidly.
4. Conclusion:
Based on the information given, when the capacitance is added in series and the current through the source increases, it suggests that the black box element is an inductance (L). The inductor causes the current to lag the voltage, resulting in a lower current magnitude.
Therefore, the correct answer is option 'B' - an inductance.
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A two terminal black box contains one of the R-L-C elements. When the black box is connected to a 220 V ac supply, the current through the source is I. When a capacitance of 0.1 F is inserted in series between the source and the box, the current through the source is 2I The element isa)a resistanceb)an inductancec)a capacitanced)it is not possible to determine the elementCorrect answer is option 'B'. Can you explain this answer?
Question Description
A two terminal black box contains one of the R-L-C elements. When the black box is connected to a 220 V ac supply, the current through the source is I. When a capacitance of 0.1 F is inserted in series between the source and the box, the current through the source is 2I The element isa)a resistanceb)an inductancec)a capacitanced)it is not possible to determine the elementCorrect answer is option 'B'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about A two terminal black box contains one of the R-L-C elements. When the black box is connected to a 220 V ac supply, the current through the source is I. When a capacitance of 0.1 F is inserted in series between the source and the box, the current through the source is 2I The element isa)a resistanceb)an inductancec)a capacitanced)it is not possible to determine the elementCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A two terminal black box contains one of the R-L-C elements. When the black box is connected to a 220 V ac supply, the current through the source is I. When a capacitance of 0.1 F is inserted in series between the source and the box, the current through the source is 2I The element isa)a resistanceb)an inductancec)a capacitanced)it is not possible to determine the elementCorrect answer is option 'B'. Can you explain this answer?.
A two terminal black box contains one of the R-L-C elements. When the black box is connected to a 220 V ac supply, the current through the source is I. When a capacitance of 0.1 F is inserted in series between the source and the box, the current through the source is 2I The element isa)a resistanceb)an inductancec)a capacitanced)it is not possible to determine the elementCorrect answer is option 'B'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about A two terminal black box contains one of the R-L-C elements. When the black box is connected to a 220 V ac supply, the current through the source is I. When a capacitance of 0.1 F is inserted in series between the source and the box, the current through the source is 2I The element isa)a resistanceb)an inductancec)a capacitanced)it is not possible to determine the elementCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A two terminal black box contains one of the R-L-C elements. When the black box is connected to a 220 V ac supply, the current through the source is I. When a capacitance of 0.1 F is inserted in series between the source and the box, the current through the source is 2I The element isa)a resistanceb)an inductancec)a capacitanced)it is not possible to determine the elementCorrect answer is option 'B'. Can you explain this answer?.
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