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# Dependence of Potential Difference Across a Resistor on Current with Graph - Physics Practical Class 10 Viva Questions with Answers

1. Define the potential difference.

Answer: Potential Difference is defined as the work done to move a unit charge from one point to the other.

1. What is the SI unit of potential difference?

Answer. The SI unit of potential difference is volt.

1. Define electromotive force.

Answer: The electric potential produced by either an electrochemical cell or by changing the magnetic field is known as electromotive force.

1. What is the symbol used to represent the electromotive force?

Answer: The symbol used to represent the electromotive force is ε.

1. What is the formula of Ohm’s law?

Answer: The formula of Ohm’s law is V = IR.

1. Is potential difference a constant?

Answer: Potential difference is not a constant.

1. Can EMF be negative?

Answer: Yes, the electromotive force can be negative.

1. Define terminal voltage.

Answer: Terminal voltage is defined as the potential difference across the terminals of a load when the circuit is on.

1. Which instrument is used to measure the potential difference?

Answer: The potentiometer is used to measure the potential difference.

1. Which instrument is used to measure the terminal voltage?

Answer: The voltmeter is used for measuring the terminal voltage.

1. State true or false: The resistance of a wire is directly proportional to its length.

1. What is the formula to calculate the electromotive force?

Answer: The formula to calculate the electromotive force is: ε = V + Ir.

1. What is the SI unit of electric charge?

Answer: Coulomb is the SI unit of electric charge.

1. Which letter is used to represent the potential difference?

Answer: The potential difference is represented by the letter ‘V’.