I was wondering why using different AC frequency makes some devises not working.
I found that I do not need to adjust frequency for using electric heat or electromagnetic wave such as ・rice cooker ・toaster ・stove ・light bulb ・TV ・radio
And for these appliance, I do not need to change the frequency but it will behave differently under different frequency. They are using motor. ・vacuum cleaner ・food processor ・fan ・fridge
For these appliance, I need to convert frequency. ・washing machine ・clothes dryer ・video tape recorder ・fluorescent light ・clock ・microwave oven
The thing I felt strange is that washing machine and clothes dryer also uses motor. Although, they cannot be used in wrong frequency. In electronic devises, why frequency matters? Is it related to clock frequency? And why there is a motor device that can be and can't be used in different frequency?