How to use 5V relay module to switch circuits with Arduino Nano

Here I am demonstrating the use of 5V relay module to switch a 12V/1.5A automotive bulb using the digital output of Arduino Nano. Same principle can be used to drive a Stepper Motor to control an antenna rotator. Only 3.5mA is drawn from the D13 pin of the Arduino Nano, which has a capability of up to 20mA. 5V supply to the relay module circuit is provided by the 5V pin of the Arduino Nano board. Blinking LED public domain sketch available in Arduino IDE platform has been edited from 1s ON/1s OFF to 5s ON/5s OFF to make the demo of current drains easier. If the switching is fast, the multimeter will not have sufficient time to display the currents properly!