This may seem a bit left field but a heater element is apparently a great resistor to use when testing, in order to limit the current flowing through your set up. Fortunately, I hadn’t gotten around to scrapping our old washing machine that just had too many faults to repair last year after many years of service. So my daughter and I stripped it down and extracted this element, along with a lot of useful wires and some solenoid valves that may be useful in future projects.