What phenomenon can explain the home TV, lights, fans and other electrical appliances are used in parallel?

What phenomenon can explain the home TV, lights, fans and other electrical appliances are used in parallel?

1. When the filament of the bulb burns out and the lamp doesn't work, the electric fan and TV set can work as usual
2. When the electric fan is turned on first and then the lamp is turned on, the brightness of the lamp is normal and not affected