Variable inductance coil. No investigation into electromagnetic theory is complete without measuring the inductance and self-inductance of a current-carrying coil (depending on the insertion of an iron core) and exploring AC circuits. Our copper wire coil features a shock-resistant plastic casing with lifting handles, a coated iron core mounted on a worm screw for moving in and out of the coil, and a scale printed in cm for reading the length of core inserted into the coil. Number of windings: 3000. Maximum permissible voltage: 30 volts AC, 60 volts DC. Maximum permissible current: 2 ampere. Inductance: continuously adjustable from 0.15 to 1.4 H, for current of approximately 1 ampere. Resistance: 12.5 ohm. Connections: via 4mm safety plugs. Weight: 6.2 kilograms. Measures 265mm length by 145mm width by 130mm height.