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As part of our AS Physics practical exam preparation, students rolled up their sleeves and bravely entered the world of wires, resistors, and the occasional moment of mild confusion. Their mission: to investigate how the resistance of a light-dependent resistor (LDR) changes when illuminated by a light-emitting diode (LED).

The plan sounded simple enough. By adjusting the length of a resistive wire, students changed the potential difference across the LED. This changed the brightness of the light shining on the LDR, which in turn changed its resistance. Easy… in theory. In practice, it involved careful measurements, thoughtful analysis, and the occasional “Wait, who unplugged that lead?”

Armed with their data (and slightly tangled wires), students then analysed their results to test whether they could confirm the predicted relationship between the variables. Science at work!

Experiments like this are perfect for demystifying Physics. With a systematic approach, steady hands, and a bit of patience, even a table full of voltmeters, leads, and mysterious components can eventually be tamed.