VI Characteristics: Investigating the Relationship between Current and Potential Difference in a Light Bulb

In this video, Matt demonstrates an experiment to investigate the relationship between current and potential difference across a light bulb. He replaces a resistor with a light bulb in a circuit, measures voltage and current, and records the data. Matt then reverses the current direction to observe changes. The data is graphed, showing a non-linear relationship, indicating that the bulb's resistance increases with potential difference. The experiment concludes that the bulb behaves the same regardless of current direction.

What is the first step Matt takes to adapt the circuit for investigating the light bulb?

• He increases the voltage.

• He replaces the resistor with a light bulb.

• He disconnects the ammeter.

• He adds a second resistor.

How does Matt ensure the voltmeter measures the potential difference across the bulb?

• By connecting it to the ammeter.

• By connecting it in series with the bulb.

• By connecting it in parallel to the bulb.

• By connecting it to the power supply.

What is the purpose of increasing the potential difference in steps?

• To observe changes in current with each step.

• To test the durability of the bulb.

• To calibrate the voltmeter.

• To measure the resistance of the bulb.

What change does Matt make to reverse the direction of the current?

• He reverses the connections at the power pack.

• He increases the voltage.

• He adds another bulb.

• He switches the power pack off and on.

What is the significance of plotting the data on a graph?

• To determine the exact resistance of the bulb.

• To compare different types of bulbs.

• To check the accuracy of the voltmeter.

• To visualize the relationship between potential difference and current.

What does the curve of best fit on the graph indicate?

• The bulb's resistance is constant.

• The bulb's resistance decreases with potential difference.

• The bulb's resistance is unaffected by current.

• The bulb's resistance increases with potential difference.

How does the direction of current affect the bulb's behavior?

• The bulb behaves differently with reversed current.

• The bulb does not light up with reversed current.

• The bulb's behavior is unaffected by current direction.

• The bulb's resistance decreases with reversed current.

What conclusion can be drawn about the bulb's resistance as potential difference increases?

• The resistance remains constant.

• The resistance decreases.

• The resistance fluctuates randomly.

• The resistance increases.

What is the relationship between potential difference and current as observed in the experiment?

• Current increases linearly with potential difference.

• Current decreases as potential difference increases.

• Current increases at a decreasing rate with potential difference.

• Current remains constant regardless of potential difference.

What does the symmetry of the curve on the graph suggest about the bulb's behavior?

• The bulb does not conduct in one direction.

• The bulb's resistance is higher in one direction.

• The bulb's behavior is symmetrical in both directions.

• The bulb behaves differently in each direction.