Normally it is written on the plug, device or stated in the manual. Most devices can handle both ranges (it will be stated as a range, e.g. 110-250V (AC), if it is usable for 220-250V you can assume the frequency is not a problem for Europe neither, and same for 110VAC elsewhere. This is a disguised good question.
Using transformers helps you decrease the capacity and vice versa. With the North American single-voltage device, its power is from 110V to 125V. The countries having a power supply ~ 230V require equipping a step-down transformer. Keep in mind, the wattage rating of your device must be smaller than the rating of a transformer when plugging in.
Yes, you can connect your laptop charger to an electrical outlet in Rwanda as long as the outlet is compatible with the charger's voltage and plug type. In Rwanda, the standard voltage is 230V and the standard frequency is 50Hz. Most laptop chargers are designed to be compatible with a range of voltages (dual voltage), so they should work with
I bought a Grundfos 10GPM 115v pump (3 wire +ground) and a control box from two separate online vendors, and the control box was a 230v control box (with the 1/2 hp rating that my well pump has). I only paid attention to the HP rating when I ordered the control box, as the model number is very similar for the two Grundfos 1/2 hp control boxes
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can i use 250v in 230v