Take two thin nichrome wires of equal length and different thickness approximately one of these wire Class 8

Take two thin nichrome wires of equal length and different thickness approximately one of these wire Class 8

Take two thin nichrome wires of equal length and different thickness (approximately one of these wire thickness to be double of the other, say 0.3 mm and 0.6 mm). Connect them one by one in a circuit which has a switch and a cell, and allow the current to flow for 30 s in each case. Momentarily touch these wires. Which wire heats up more? Now repeat the same activity with two nichrome wires of same diameter but of different lengths. Prepare a brief report of your activity. Class 8

Answer:

Part 1: Same Length, Different Thickness

Two nichrome wires of the same length (example: 10 cm) but different thickness (0.3mm and 0.6 mm) are used one by one in a circuit, and current flows for 30 seconds.

Result: The thinner nichrome wire (0.3mm) becomes hotter than the thicker wire (0.6 mm), because thinner wires have higher resistance and produce more heat when current flows.

Part 2: Same Thickness, Different Lengths Two wires of same thickness but different lengths (10 cm and 20 cm) are tested the same way.

Result: The longer wire becomes warmer because it has more resistance than the shorter wire.

Brief Report: Nichrome wires with more resistance (thinner or longer) heat up more when electric current flows through them. That is why in electrical appliances, thin and long wires are used as heating elements.