Neon circuit tester has no power by itself but uses a neon indicator light connected to a ballast resistor, and the light only glows when power is present. As the voltage increases, the neon test light glows brighter.

The Megger is the instrument uses for measuring the resistance of the insulation. It works on the principle of comparison, i.e., the resistance of the insulation is compared with the known value of resistance. If the resistance of the insulation is high, the pointer of the moving coil deflects towards the infinity, and if it is low, then the pointer indicates zero resistance. The accuracy of the Megger is high as compared to other instruments.

Megger is used to test the new wiring installation.

When we switch on a light bulb, it is due to the heating effect of electric current, and when we turn the ceiling fan on, it is due to the magnetic effect of current.

Magnetic Effect of Electric Current – A magnetic field is a force field that is created by magnetic dipoles and moving electric charges, and it exerts a force on other nearby moving charges and magnetic dipoles.

800 watt is the maximum permissible load for a light and fan sub circuit as per IE rules.