Temperature and Electrical Resistance
Temperature and Electrical Resistance is how heat changes how well power flows through a material.
A tray holds a layer of small balls rolling toward one end. At low heat the balls move slow and rarely bump into each other, so they flow freely. When you heat the tray, all the balls speed up and bounce off each other nonstop. Those extra bumps slow the flow. A hot wire fights the flow of power the same way.
Explaining temperature and electrical resistance by grade level
Wires carry power from one place to another. When a wire gets hot, it is harder for power to flow. A cold wire lets power move more freely. That is why solar cells work better on cool days.
Projects that explore temperature and electrical resistance
Heat changes how well power flows through a solar cell, and you can measure this shift directly. Temperature affects the voltage, current, and power generated by a solar cell — higher temperatures reduce all three. When the cell cools down, the power rises again, showing how heat alters the flow of electricity through the cell material.
Heat changes how well power flows through a material, and solar cells demonstrate this clearly. On a sunny day, a solar panel heats up quickly, and that rising temperature may lower its electrical output. The fan-cooled cell produces the most power because reducing heat allows electricity to flow more freely through the cell.