Electrical Engineering XYZ MCQs
Which one of the following units is a fundamental unit:
- Ampere
- Joule/sec
- Newton
- Watt
Correct answer: 1. Ampere
Explanation: Fundamental units are those that are defined independently and do not rely on other units for their definition. In the International System of Units (SI), there are seven fundamental units. These are:
- Meter (m) for length
- Kilogram (kg) for mass
- Second (s) for time
- Ampere (A) for electric current
- Kelvin (K) for temperature
- Mole (mol) for amount of substance
- Candela (cd) for luminous intensity
Among the options provided:
- Ampere (A) is the unit of electric current and is one of the fundamental units.
- Joule/sec is a unit of power, also known as watt (W), which is derived from fundamental units. It’s not a fundamental unit itself.
- Newton (N) is the unit of force, derived from mass, length, and time units. It’s not a fundamental unit.
- Watt (W) is the unit of power, derived from fundamental units (kilogram, meter, and second). It’s not a fundamental unit itself.
So, the only fundamental unit among the options is Ampere (A).