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To determine the polarity of the voltage drop across a resistor, it is necessary to know.
- a)Value of current through the resistor
- b)Direction of current through the resistor
- c)Value of resistor
- d)emf in the current
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
To determine the polarity of the voltage drop across a resistor, it is...
To determine the polarity of the voltage drop across the resistor, it is necessary to know the direction of the current through the resistor.
The terminal entering the current gives a positive sign of voltage drop.
The terminal entering the current gives a positive sign of voltage drop.
Most Upvoted Answer
To determine the polarity of the voltage drop across a resistor, it is...
Explanation:
To determine the polarity of the voltage drop across a resistor, it is necessary to know the direction of current through the resistor. The polarity of the voltage drop across a resistor depends on the direction of the current flowing through it.
Direction of Current:
The direction of current flow is determined by the flow of positive charges. By convention, the direction of current flow is considered to be the direction in which positive charges would flow. In reality, electrons are the actual carriers of charge in most conductors, and they flow in the opposite direction to the conventional current. However, for the purpose of determining the polarity of the voltage drop across a resistor, we consider the direction of conventional current.
Polarity of Voltage Drop:
The voltage drop across a resistor is always in the direction opposite to the direction of current flow. This means that the positive terminal of the resistor is at a higher potential than the negative terminal. The voltage drop is always measured from the higher potential to the lower potential.
Example:
Let's consider a simple circuit with a resistor connected to a battery. If the current flows from the positive terminal of the battery to the negative terminal, then the voltage drop across the resistor will be positive. On the other hand, if the current flows from the negative terminal to the positive terminal, then the voltage drop across the resistor will be negative.
Conclusion:
In conclusion, to determine the polarity of the voltage drop across a resistor, it is necessary to know the direction of current through the resistor. The voltage drop is always in the direction opposite to the direction of current flow.
To determine the polarity of the voltage drop across a resistor, it is necessary to know the direction of current through the resistor. The polarity of the voltage drop across a resistor depends on the direction of the current flowing through it.
Direction of Current:
The direction of current flow is determined by the flow of positive charges. By convention, the direction of current flow is considered to be the direction in which positive charges would flow. In reality, electrons are the actual carriers of charge in most conductors, and they flow in the opposite direction to the conventional current. However, for the purpose of determining the polarity of the voltage drop across a resistor, we consider the direction of conventional current.
Polarity of Voltage Drop:
The voltage drop across a resistor is always in the direction opposite to the direction of current flow. This means that the positive terminal of the resistor is at a higher potential than the negative terminal. The voltage drop is always measured from the higher potential to the lower potential.
Example:
Let's consider a simple circuit with a resistor connected to a battery. If the current flows from the positive terminal of the battery to the negative terminal, then the voltage drop across the resistor will be positive. On the other hand, if the current flows from the negative terminal to the positive terminal, then the voltage drop across the resistor will be negative.
Conclusion:
In conclusion, to determine the polarity of the voltage drop across a resistor, it is necessary to know the direction of current through the resistor. The voltage drop is always in the direction opposite to the direction of current flow.
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To determine the polarity of the voltage drop across a resistor, it is necessary to know.a)Value of current through the resistorb)Direction of current through the resistorc)Value of resistord)emf in the currentCorrect answer is option 'B'. Can you explain this answer?
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