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switches - "Normally closed" switch: does it use more power than a "Normally open" for a low-power battery-powered ATtiny project? - Electrical Engineering Stack Exchange
What is meant by a closed switch? - Quora
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Tim Leffelman - Normally Open vs Normally Closed
Normally Open vs Normally Closed Switch | Learn Differences
Normally Open vs Normally Closed Switch | Learn Differences
Normally-open and Normally-closed Switch Contacts
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Switches • Electricity • Physics Fox
