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On many common appliances, there is an “O” or “I” on the power switch. What does each symbol mean?
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On many common appliances, there is an “O” or “I” on the power switch. What does each symbol mean?

User Efrat
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"I" symbol means the current goes through the system (imagine the 'I' being a line, like a circuit connecting [power to the device]) "O" symbol means the current does not go through the system. ( the circle is an open circuit, having no power flowing through it
User Eddy Pronk
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