The 2 elements when taken out, test at 10 ohms each, but when one is inserted in heater and wired, it still tests 10 ohms at screws, but when 2nd in also inserted and wired to thermostat, the ohms reading at screws on both elements only reads 5 ohms. Does the thermostat need to be replaced?
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Best Answer
When the elements are properly installed they are in parallel. 2 10 ohm resistors in parallel is equal to 5 ohms so your elements are wired in parallel and this is the normal way to wire them.
If you want to learn more read up on Ohms law
The calculation 1/RT= 1/R1 + 1/R2
RT is total resistance for parallel resistances.
R1 is heater 1 resistance value
R2 is heater 2 resistance value.
So 10 ohms in parallel with 10 ohms is 5 ohms