Podcast
Questions and Answers
What does Ohm's law state?
What does Ohm's law state?
- Resistance in a conductor is inversely proportional to the current
- Current in a conductor is inversely proportional to the potential difference
- Current in a conductor is directly proportional to the potential difference (correct)
- Potential difference in a conductor is directly proportional to the resistance
How is Ohm's law mathematically expressed?
How is Ohm's law mathematically expressed?
- $P = rac{I}{R}$
- $V = rac{I}{R}$
- $V = IR$ (correct)
- $P = IV$
What is the unit of resistance?
What is the unit of resistance?
- Farad
- Watt
- Henry
- Ohm (correct)
What happens to the current if the potential difference across a conductor is halved?
What happens to the current if the potential difference across a conductor is halved?
What are the two main limitations of Ohm's law?
What are the two main limitations of Ohm's law?
What happens to the ratio V/I when temperature is not kept constant?
What happens to the ratio V/I when temperature is not kept constant?
What happens to resistance as the temperature of a conductor increases?
What happens to resistance as the temperature of a conductor increases?
Which of the following is NOT a physical condition of a conductor affecting its resistance?
Which of the following is NOT a physical condition of a conductor affecting its resistance?
Why does the V-I graph for a non-ohmic resistor not form a straight line?
Why does the V-I graph for a non-ohmic resistor not form a straight line?
Which unit is used to measure potential difference?
Which unit is used to measure potential difference?
In an electric circuit, why is the potential difference across the cell terminals higher when the cell is not in use?
In an electric circuit, why is the potential difference across the cell terminals higher when the cell is not in use?
What happens to the terminal voltage when no current is drawn from a cell?
What happens to the terminal voltage when no current is drawn from a cell?
