Power resistors are marketed as fixed resistors as well as shiftable ones attached on pipes. Multiple resistors can be availed upon special request from the customer.
Tightly coiled, oxidised constantan wire. The oxide coating serves as insulator, which makes these resistors also suitable for high voltage.
The gaps between the coils of the wire qualify these resistors to deal with pulsating currents specifically. The resistors are cemented to keep the wire from moving and changing gap spacing. Resistor values can be inquired separately.