Final answer:
A Digital Multimeter (Option B) combines a voltmeter, ohmmeter, and ammeter. It uses an analog-to-digital converter for accurate readings, making it more precise than analog meters which use a galvanometer to measure current and voltage with a needle and scale.
Step-by-step explanation:
The type of electrical meter that combines a voltmeter, ohmmeter, and ammeter is a Digital Multimeter (Option B). Analog multimeters also combine these features, but most analog meters have been replaced by digital ones.
A digital multimeter uses an analog-to-digital converter to accurately measure and display readings in a number format, making it easier and more precise to read.
Volts are measured by a voltmeter, which in digital multimeters, is based on an analog-to-digital conversion process as opposed to the mechanical deflection of a needle in analog devices.
Ammeters, which measure current, are included in digital multimeters with a similar digital approach, enhancing the accuracy compared to traditional analog meters based on a galvanometer.
Analog Multimeters rely on a galvanometer for their operation, with modifications made for the device to function as a voltmeter or an ammeter.
They have a needle that points to a scale to indicate the measurement. However, due to the advancements in technology and the convenience of reading precise numeric values, digital multimeters have become more prevalent in use.