In the process subsystem, the transistor acts as an electronic switch. The labels: b, c and e, indicate its base, collector and emitter connections. When the base receives a certain voltage from the previous input sensor, or switch trigger, the system's output(s) will automatically switch on. To see the required "switch on" voltage, move the white pointer to adjust the brightness. At the point the transistor turns on, note the voltage reading on the multimeter. When this voltage is met, or exceeded, output current is able to flow into the collector and out of the emitter. You can see the switch below the circuit for a representation of this. Further Reading:
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