One of the most common symbols is on the on/off switch to your telly. According to an explainer by cracked.com on Facebook, ...
the power symbol was born: a large circle (0) interrupted by a small vertical line (1). This language-agnostic design was meant to convey that a switch or button was in charge of toggling its ...
When the switch is tuned off, the circuit is open so the electrical energy stops flowing. Circuit symbols are really useful when designing the electrical circuits inside the things we use.
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