"Tony Hwang" wrote in message
...
TimR wrote:
That's interesting. My lights dim slightly when the heat pump compressor
kicks on, but not at all when the oven cycles.

Hi.
Motor is inductive load. Heating element inductance is negligible, it is
resistive load.

The motor also has a very low resistance/reactance while it is getting up to
speed.

The oven element also has a low resistance before heating up, but not nearly
as low to high resistance ratio as the motor. It will also usually heat up
much faster than the motor will get up to speed. The lights may have enough
thermal lag to take care of the oven cycling.