Bulb Structure

A bulb is an electrical device that produces light through the heating of a filament. It consists of several components, including a glass envelope, a filament, and terminals for electrical connections. The correct answer to the given question is option 'B', which states that a bulb has two terminals and one filament. Let's explore this in detail.

Components of a Bulb

1. Glass Envelope: The glass envelope of a bulb provides a protective covering for the internal components. It is transparent to allow the emitted light to pass through.

2. Filament: The filament is a thin wire that is typically made of tungsten. When an electric current passes through the filament, it heats up and emits light. The filament is the main component responsible for producing light in a bulb.

3. Terminals: Terminals are the electrical connections on a bulb. They provide a means to connect the bulb to an electrical circuit. A bulb usually has two terminals, one positive and one negative, which allow the flow of electricity through the filament.

Explanation of Option 'B'

Option 'B' states that a bulb has two terminals and one filament. This is the correct answer because it accurately describes the basic structure of a typical bulb. The two terminals, positive and negative, provide the necessary electrical connections, while the single filament is responsible for producing light.

Other Options

Let's briefly discuss the other options given in the question and why they are incorrect:

- Option 'A': This option suggests that a bulb has two terminals and two filaments. However, this is not true for a standard bulb. Most bulbs have a single filament, as mentioned earlier, which is responsible for producing light.

- Option 'C': This option states that a bulb has multiple terminals and a single filament. While there are some specialized bulbs that may have multiple terminals for specific purposes, the standard household bulb typically has only two terminals.

- Option 'D': This option suggests that a bulb has a single terminal and a single filament. However, a bulb requires two terminals to complete an electrical circuit and allow the flow of current.

In conclusion, a typical bulb has two terminals and one filament. The terminals provide the necessary electrical connections, while the filament produces light when heated by the electric current.