Resistance and Ohmic Conductors Concepts

The video tutorial explores an experiment to determine if a constantine wire adheres to Ohm's Law. The wire's length is fixed at 20 cm to maintain constant resistance. The graph's gradient, representing resistance, remains constant for the wire, confirming it as an ohmic conductor. In contrast, the filament bulb's resistance increases, indicating it is a non-ohmic conductor. The tutorial concludes by differentiating between ohmic and non-ohmic conductors based on their adherence to Ohm's Law.

What is the purpose of fixing the length of the constantan wire at 20 centimeters in the experiment?

• To change the resistance

• To keep the resistance constant

• To increase the current

• To decrease the voltage

In the graph analysis, what does a constant gradient represent?

• Voltage

• Current

• Resistance

• Power

What happens to the resistance when the gradient of the graph increases?

• Resistance decreases

• Resistance remains the same

• Resistance becomes zero

• Resistance increases

Why is the constantan wire considered an ohmic conductor?

• It sometimes obeys Ohm's Law

• It never obeys Ohm's Law

• It always obeys Ohm's Law

• It does not obey Ohm's Law

Why is the filament bulb classified as a non-ohmic conductor?

• It always obeys Ohm's Law

• It never obeys Ohm's Law

• It obeys Ohm's Law at high temperatures

• It sometimes obeys Ohm's Law