The first electric bulb in the world was made by an American scientist named Thomas Alva Edison in 18. When an electric current is passed through a wire, the wire heats up, becomes bright, and radiates light. Edison uses this religion of electric current to make bulbs. In fact, electric bulbs convert electrical energy into heat and light energy. Inside the glass bulb, a thin platinum wire coil is attached and sealed. When the two ends of the coil are connected to an electric source, it turns red and begins to emit light. Tungsten filaments are sealed inside modern electric bulbs. The bulb is filled with nitrogen and argon gas to prevent it from melting. The two ends of the filament are attached to the cap of the bulb. The cap is coated with a non-conductive material so that the two ends of the filament do not come in contact with each other. When current flows through the filament, it first turns red and then white. This white filament continues to give us light.