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Which of the following is a unit of power in the SI system?
Joule
Watt
Newton
Pascal
Watt
The SI unit of power is the Watt (W), which is defined as the rate of doing work or the rate of energy transfer. One Watt is equivalent to one Joule per second (1W=1J/s).
The SI unit of power is the Watt (W), which is defined as the rate of doing work or the rate of energy transfer. One Watt is equivalent to one Joule per second (1W=1J/s).
If work is the amount of dirt moved, power is the speed of the excavator moving it; a high-wattage device finishes the task faster than a low-wattage one.
W-E-T: Watt = Energy / Time.
P=tWтАЛ тАФ Power equals Work done divided by time taken
P=tEтАЛ тАФ Power equals Energy consumed divided by time taken
Power measures the speed at which work is performed. Since work is measured in Joules (J) and time in seconds (s), power is derived from the quotient of energy and time. A device with higher power completes the same amount of work in a shorter duration.
The Watt is named after James Watt, the inventor of the steam engine.
Power is a scalar quantity because it only involves magnitude and not direction.
The SI base units for Watt are kgтЛЕm2тЛЕsтИТ3.
Provides a standardized metric for measuring the efficiency and output of electrical and mechanical systems.
Does not account for the total energy consumed over a period (for that, we use Watt-hours).
Rating of electrical appliances like bulbs and motors.
Measuring the output power of engines and generators.
1 Horsepower (hp) is approximately 746W.
Joule is the unit of energy (A), Newton is the unit of force (C), and Pascal is the unit of pressure (D).
B is correct тАФ The Watt is the standard SI unit defined as the transfer of one Joule of energy per second.
Always remember the difference between Work (Joule) and Power (Watt/Joule per second). In exams, questions often swap these units to test conceptual clarity.
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