How to Carry Out an Experiment to Investigate the Relationship Between Resistance and Wire Length

The video tutorial covers a physics experiment on measuring the resistance of a microwire as its length changes. It begins with an overview of the required equipment and circuit setup, followed by a discussion on the independent and dependent variables, as well as the controls needed to ensure a fair test. The procedure for conducting the experiment is detailed, including safety precautions. Finally, the video explains how to analyze the data using a scatter graph and draw conclusions about the proportionality between wire length and resistance.

What is the independent variable in the experiment involving the microwire?

• The temperature of the wire

• The thickness of the wire

• The length of the microwire

• The material of the wire

Why is it important to open the switch before adjusting the crocodile clips?

• To avoid electric shock

• To prevent the wire from cooling down

• To prevent the wire from overheating

• To reset the circuit

What is the purpose of using a scatter graph with a line of best fit in this experiment?

• To show the relationship between resistance and wire length

• To measure the thickness of the wire

• To calculate the potential difference

• To determine the material of the wire

How can you calculate the resistance per unit length of the wire?

• By subtracting the length from the resistance

• By adding the resistance and length

• By multiplying the resistance by the length

• By dividing the total resistance by the total length

What conclusion can be drawn if the graph of resistance against length is a straight line through the origin?

• Resistance is inversely proportional to length

• Resistance decreases with increasing length

• Resistance is proportional to length

• Resistance is constant regardless of length