Variation of Current with respect to Length

The Variation of Current with Respect to Length of Wire Model is a precise and well-crafted physics teaching aid designed to experimentally demonstrate how the resistance of a conductor varies with its length, and consequently how the current through a circuit changes as the length of the wire increases. This model provides students with a direct, hands-on understanding of Ohm's Law and the factors affecting electrical resistance a fundamental concept in Class 1012 physics curricula across CBSE, ICSE, and State Boards.

The apparatus features three copper wire coils of progressively increasing length labelled L1, L2, and L3 each wound uniformly on red plastic arch-shaped bobbin holders and mounted securely on a sturdy blue acrylic base. The coils are arranged in increasing order of wire length, visually showing the increase in resistance as length increases. The base is fitted with colour-coded banana plug terminals Red (positive/input), Black (negative/output), and Yellow (measurement point) along with clearly labelled connection points for Ammeter (A1, A2, A3) and a 2V power supply input, enabling direct current measurement across each coil.