Joules: The Unit for Energy
The question asks to identify the physical quantity measured in 'joules'.
- The joule (symbol: J) is the standard international (SI) unit for measuring energy, work, and heat.
- One joule is the energy transferred or work done when a force of one newton acts on an object over a distance of one meter in the direction of the force. Mathematically, 1 J = 1 N·m.
- Other options represent different physical quantities:
- Power is measured in watts (W).
- Force is measured in newtons (N).
- Velocity is measured in meters per second (m/s).
Therefore, energy is the quantity measured in joules.
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