Which of the following is true of digital meters?
A. They measure only voltage. B. They provide analog readings. C. They are less accurate than analog meters. D. They display readings as numerical values.
The Correct Answer and Explanation is :
The correct answer is D. They display readings as numerical values.
Explanation:
Digital meters, also known as digital multimeters (DMMs), are electronic devices used to measure various electrical parameters such as voltage, current, and resistance. Unlike analog meters, which utilize a needle and a dial to indicate measurements, digital meters provide a direct numerical readout of the measured values. This characteristic offers several advantages over traditional analog meters.
One of the primary benefits of digital meters is their ease of use. The numerical display allows for quick and clear readings, reducing the chances of misinterpretation that can occur with analog scales. For instance, when reading an analog meter, the user must estimate the needle’s position between marks, which can lead to errors, particularly in low-light conditions or for individuals with vision impairments. In contrast, digital meters present a straightforward, precise value, which is particularly advantageous in environments where accuracy is critical.
Digital meters also offer greater accuracy and resolution than many analog meters. They typically have a higher internal resolution, allowing them to detect smaller changes in voltage, current, or resistance. Additionally, digital multimeters often include features such as automatic ranging, which adjusts the measurement range to provide the most accurate reading without requiring manual adjustments by the user.
Moreover, many modern digital meters come equipped with additional functionalities, such as the ability to measure frequency, capacitance, and temperature, making them versatile tools in electrical testing and troubleshooting.
In summary, digital meters are distinguished by their ability to display measurements as numerical values, providing enhanced accuracy, clarity, and functionality compared to analog counterparts. This makes them essential tools for both professionals and hobbyists in electrical work.