Photovoltaic Effect
Photovoltaic Effect is when light hits a solar cell and creates power.
A dark tray holds a single layer of marbles packed tight side by side. When you shine a bright light on the tray, the light knocks some marbles loose from their spots. Those freed marbles roll toward one end of the tray, making a steady stream. That stream of moving marbles is the power — light turned into flow.
Explaining photovoltaic effect by grade level
A solar cell turns sunlight into power. When light hits the cell, it pushes tiny bits inside. Those bits flow and make electricity. More light means more power.
Projects that explore photovoltaic effect
A solar cell generates voltage and current when light strikes it, but temperature changes how well that process works. You investigate by exposing a solar cell to different temperatures and measuring the voltage in millivolts, the current in milliamps, and the power in watts. Power tends to be higher at lower temperatures.
The angle of the sun's rays affects how much power a solar cell produces. You mount the cell on a board, move it to different angles with the sun, and measure the voltage going to the cell at each position. When the solar cell sits perpendicular to the sun's rays, the power going to the cell is maximized.
When light strikes a solar cell, it creates electrical power — and concentrating more sunlight onto the cell increases that conversion. You set up the cell outdoors, then measure its voltage and current with no reflector, with a flat mirror, and finally with an aluminum-covered parabolic dish. The parabolic reflector produces the highest power output, followed by the flat mirror.
How a solar cell is angled toward the sun shapes how much power it generates. You mount seven identical solar cells on wooden blocks cut to different angles, then measure the voltage and current from each at noon on a clear day. The cell aimed straight at the sun produces the most power, and output drops steadily as the angle moves away from perpendicular.
The photovoltaic effect generates electricity when light strikes a solar cell, but rising temperature may lower its electrical output. Cooling a solar cell preserves its ability to convert light into power. A fan-cooled cell produces the most power, while a cell on a hot metal plate that traps heat produces the least.