Ohm's Law

Q.

What is the resistance of a circuit with voltage 40 V and current 8 A?

1. 32 ohm

2. 32 ohm
3. 5 ohm

4. 10 ohm

Q.

The current flowing through a conductor is directly proportional to .................... between the ends of the conductor, provided the temperature and the state of matter of the conductor remain unchanged.

__

Q. Which of the following does not obey Ohm’s Law?

1. Alloys
2. Diodes
3. Metals
4. None of these

Q.

Ram has an LED of resistance 10 Ω which will only light up if the current provided is exactly 1A. He also has 10 two volt cells. Find out how many cells will Ram need to light up the LED?

1. 2

2. 5

3. 10

4. 1

Q.

Ohm’s law gives the relation between potential difference and electric current.

1. True

2. False

Q.

Which of the following statement(s) is/are true, regarding the electrical set-up for verification of Ohm's law?

1. The voltmeter is connected in parallel with the known resistance.

2. The ammeter is connected in series in the circuit.

3. The rheostat can only increase the resistance in the circuit.

4. There is a sliding contact on the coil which is used to change the value of resistance.

Q.

Which among the below statements is the correct statement for Ohm’s Law?

1. The potential difference V, across the ends of a given metallic wire in an electric circuit is inverselyproportional to the current(I) flowing through it.

2. The potential difference V, across the ends of a given metallic wire in an electric circuit is inversely proportional to the current(I) flowing through it; provided its temperature remains constant.

3. The potential difference V, across the ends of a given metallic wire in an electric circuit is directly proportional to the current(I) flowing through it.

4. The current(I) flowing through a given metallic wire in an electric circuit is directly proportional to the potential difference V across the ends of it, provided its temperature remains constant.

Q.

Ohm’s Law gives the relation between ?

1. Voltage, Work

2. Current, Resistance

3. Voltage, Current

4. Voltage, Resistance

Q.

If the voltage across 2 points is 5V, what is the current in the circuit when resistance in the circuit is 15Ω?

1. $\frac{1}{3}$ A

2. 3 A

3. 20 A

4. 10 A

Q. When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.
[ 2 marks]
[NCERT Exercise]
[Ohms law]