Portable, heavy duty educational model. Provides a variable resistance in electrical circuits. Oxidized contantan wire is wound on viterous enameled tube. Sliding contact carriage, mounted on the slide bar, carries a phosphor bronze contact for long life. 3 binding posts, one at each end of the winding and the other at the end of the slide bar for electrical connections.
· Maximum current: 5 Amps.
· Resistance: 11 Ohms.
· Tube size: 300 x 44mm.
· Sliding carriage, air cooled.