When voltage is applied to the coil then the relay switches and now T1 (plus ... In this second application we can use the DPDT switch to choose between 2 different load and have a visual indication ...

When asked to estimate the coil current of a small Omron G5V-2 DPDT relay, most guessed around ... Even the tiny Omron G5V-1 SPDT relay shown in the examples below has a coil current of 30mA at 5V.