Finding Resistance: Investigating the Relationship between Resistance and Length of Nichrome Wire

The video tutorial demonstrates an experiment to investigate the relationship between the resistance and length of a nichrome wire. Catherine replaces a fixed resistor with a nichrome wire, measures the current and potential difference, and records the data. By varying the wire length, she calculates resistance using Ohm's Law and plots the data on a graph. The results show that resistance is directly proportional to the wire's length, confirming the linear relationship.

What is the first step Catherine takes to modify the circuit for her experiment?

• She records the potential difference.

• She replaces the fixed resistor with nichrome wire.

• She switches on the power supply.

• She measures the current.

Why does Catherine switch off the power supply between measurements?

• To prevent electric shocks.

• To avoid overheating the wire.

• To recalibrate the voltmeter.

• To save energy.

Which formula does Catherine use to calculate resistance?

• R = I / V

• R = I^2 * V

• R = V * I

• R = V / I

What is the resistance of 10 centimeters of nichrome wire?

• 2.24 ohms

• 1.53 ohms

• 3.03 ohms

• 0.775 ohms

What type of relationship does the graph show between resistance and length?

• Quadratic

• Linear

• Logarithmic

• Exponential

What is the scale used for the resistance axis on the graph?

• 1 large square = 2 ohms

• 1 large square = 0.1 ohms

• 1 large square = 1 ohm

• 1 large square = 0.5 ohms

What conclusion does Catherine draw from her experiment?

• Resistance is inversely proportional to length.

• Resistance is directly proportional to length.

• Resistance is constant regardless of length.

• Resistance decreases with increasing length.

What is the constant ratio of resistance to length for the nichrome wire?

• 0.075 ohms per centimeter

• 0.15 ohms per centimeter

• 0.05 ohms per centimeter

• 0.1 ohms per centimeter

How does doubling the length of the wire affect its resistance?

• It halves the resistance.

• It doubles the resistance.

• It has no effect on the resistance.

• It quadruples the resistance.

What is the resistance of 60 centimeters of nichrome wire?

• 1.53 ohms

• 3.78 ohms

• 4.52 ohms

• 2.24 ohms