RHEOSTAT ROTARY WIRE WOUND 100W 50 OHM 1.5A
A useful rotary potentiometer that can dissipate 100 wats of power. It has a resistance of 5 ohms and can carry up to 4.5 amps. Watts is current squared times resistance. 4.5 x 4/5 x 5 = 101 watts. This unit is only 1.5 amps. 1.5 x 1.5 x 50 = 112 watts.
The unit has 3 connections and can be used as a rheostat (variable resistance) or a potentiometer (a voltage divider).
The body behind the front panel is ceramic and at full dissipation of 100 watts it is hot to touch. Some teacher supervision should be made.
The front panel has a rotary knob and 3x 4mm socket terminals that connect to each end of the resistance with the third one connecting to the wiper. Everything is exposed to teach the students the function.