Resistance and Light Dependent Resistors

The video tutorial explains an experiment to study the characteristics of a Light Dependent Resistor (LDR) by varying the distance from a light source and observing changes in resistance. It covers the necessary equipment, setup, and step-by-step instructions for conducting the experiment. Data is collected and analyzed using Ohm's Law to calculate resistance, and results are plotted on a graph to illustrate the relationship between light intensity and resistance.

What happens to the resistance of an LDR when the intensity of light increases?

• The resistance fluctuates randomly.

• The resistance remains constant.

• The resistance decreases.

• The resistance increases.

Which component is used to measure voltage in the experimental setup?

• Ohmmeter

• Voltmeter

• Thermometer

• Ammeter

What is the purpose of the milliammeter in the experiment?

• To measure resistance

• To measure voltage

• To measure current in milliamps

• To measure temperature

How is the distance between the light source and the LDR varied in the experiment?

• By moving the LDR

• By changing the light source

• By adjusting a knob

• By using different LDRs

What is the formula used to calculate resistance in this experiment?

• R = V + I

• R = I / V

• R = V / I

• R = V * I

Why is it important to calculate the mean value of resistance?

• To reduce the number of readings

• To simplify calculations

• To avoid using a graph

• To ensure accuracy

What does the Y-axis represent in the graph plotted in the experiment?

• Resistance

• Voltage

• Current

• Distance

What is the relationship between distance and resistance as shown in the graph?

• Inversely proportional

• Directly proportional

• No relationship

• Randomly related

What happens to the resistance when the light source is very near to the LDR?

• Resistance is low

• Resistance is unpredictable

• Resistance is high

• Resistance is unchanged

What unit is used for resistance in the final results of the experiment?

• Megaohms

• Ohms

• Kiloohms

• Milliohms