How do you convert a 240 v coffee maker to 120 v?

Answer 1

Yes.

On almost any appliance, line voltages can be regarded as approximate. More important is to make sure that the AC frequency is correct. Some countries use 50Hz, and some use 60Hz.

The power of the heating element at 220 volts will be about 91% of the expected power from 230 volts. (220/230)2. This does not affect the temperature of the brewing. Cheap coffee makers regulate the temperature of the water by bringing it to the boiling point, which is independent of the line voltage. Computerized coffee makers regulate the temperature of the water electronically. However, the lower power to the heating element may affect the total brewing time.

Any electronics on a coffee maker are run on a lower-voltage DC circuit, whose voltage is regulated (typically 5-12 volts). This is not affected by the line voltage.

Answer 2

Yes you use 230 volts 50Hz rice cooker in a 220 volt outlet.

Answer 3

You need a step down transformer.

Vp/Vs = Np/Ns

The ratio of voltages is equal to the ratio of coils within the transformer.

Answer 4

Yes it will work.