Experiment on the Characteristics of a Resistor and Ohm's Law

The video tutorial demonstrates an experiment to investigate the relationship between current and potential difference across a fixed resistor. Matt constructs a circuit, measures current and voltage, and records the data. He then reverses the current direction to observe changes. The results are plotted on a graph, showing a linear relationship, indicating that current is directly proportional to potential difference. The experiment concludes with the calculation of resistance, reinforcing the concept of Ohm's Law.

What is the first step Matt takes in setting up the circuit?

• Adjust the power supply voltage

• Connect the voltmeter in parallel

• Connect the ammeter in series

• Connect the resistor to the power supply

Why does Matt check the circuit before adding the voltmeter?

• To adjust the resistor value

• To verify the circuit is complete

• To ensure the voltmeter is working

• To measure the initial voltage

How does Matt record the potential difference and current values?

• By recording them in a table

• By entering them into a computer

• By writing them on a paper

• By using a digital display

What change does Matt make to reverse the current direction?

• Changes the ammeter settings

• Switches the resistor connections

• Reverses the power supply connections

• Adjusts the voltmeter position

What is the purpose of plotting the graph in the experiment?

• To determine the resistance

• To find the maximum current

• To check the accuracy of the voltmeter

• To visualize the relationship between voltage and current

How does Matt ensure accuracy when plotting points on the graph?

• By using a calculator

• By estimating the positions

• By plotting on grid lines or halfway between them

• By using a ruler

What is the significance of the graph being a straight line through the origin?

• It means the experiment was unsuccessful

• It suggests a variable resistance

• It shows the resistor is faulty

• It indicates a constant resistance

What does Matt conclude about the relationship between current and potential difference?

• They vary randomly

• They are inversely proportional

• They are directly proportional

• They are unrelated

What does the constant ratio of potential difference to current represent?

• The voltage drop across the circuit

• The efficiency of the circuit

• The resistance of the resistor

• The power of the circuit

What pattern does Matt observe in the graph for both positive and negative directions?

• A curved line

• A horizontal line

• A single straight line

• A zigzag pattern