2. What is the SI unit of energy?
Answer: B
The SI unit of energy is the joule.
Energy is quantitatively measured in joules (J) within the International System of Units (SI), making it the standard unit for energy.
A) ohm
Ohm is the SI unit of electrical resistance, not energy. It measures how much a material resists the flow of electric current and is unrelated to the measurement of energy.
B) joule
Joule is indeed the correct SI unit of energy. It is defined as the amount of energy transferred when applying a force of one newton over a distance of one meter, thus directly linking it to the fundamental concepts of energy in physics.
C) henry
Henry is the SI unit of inductance, which measures the ability of a conductor to store energy in a magnetic field. It does not pertain to the measurement of energy itself.
D) newton
Newton is the SI unit of force, defined as the amount of force required to accelerate a one-kilogram mass by one meter per second squared. While it is essential in calculating energy (force times distance), it does not represent energy directly.
Conclusion
The joule is the definitive SI unit of energy, while ohm, henry, and newton refer to different physical properties. Understanding the correct units is crucial in the field of physics, ensuring clarity and precision in scientific communication.