Electrical Engineering XYZ MCQ
Which of the following is a digital device:
- Resistance of a material
- Light switch
- Regulator of a fan
- Microphone
Correct answer: 2. Light switch
Explanation:
The light switch is a digital device.
The digital nature of a device refers to its ability to process and represent information in discrete, distinct values, typically in binary code (0s and 1s). Let’s analyze each option:
- Resistance of a material:
- The resistance of a material is a physical property related to how easily it allows the flow of electric current. It is not a digital device. It is an analog property as it can vary continuously.
- Light switch:
- A light switch is typically a mechanical device that controls the flow of electrical current to a light fixture. It’s a binary device, as it has two states (on and off), making it a digital device in a simple sense.
- Regulator of a fan:
- The regulator of a fan controls the speed of the fan, usually in a stepwise manner. While it may not be strictly binary like a light switch, it is still a digital device because it operates in discrete steps (speed levels).
- Microphone:
- A microphone converts analog sound waves into electrical signals, and it is not inherently digital. However, when used in conjunction with digital systems, the output can be digitized for processing. So, a microphone can be part of a digital system but is not inherently digital by itself.
In summary, the most straightforward and clear-cut digital device among the given options is the light switch, as it has a binary on/off state. The regulator of a fan can also be considered digital due to its stepwise control.