Relay An electrically operated switch, for example a 9V battery circuit connected to the coil can switch an AC mains circuit. The rectangle represents the coil. NO = Normally Open, COM = Common, NC = Normally Closed.
Resistor A resistor restricts the flow of charge. Uses include limiting the current passing through an LED, and slowly charging a capacitor in a timing circuit. Some publications use the old resistor symbol
Aerial (Antenna) A device to receive or transmit radio signals. It is also known as an antenna.
An OR gate can have two or more inputs. The output of an OR gate is true when at least one of its inputs is true.
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