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level: Power

Questions and Answers List

level questions: Power

Question	Answer
The rate at which energy is transferred or work is done.	Power
What is power, and what does it represent in terms of energy transfer?	Power is the rate at which energy is transferred or work is done.
Power is the rate at which energy is transferred or work is done.	Rate of Energy Transfer
What does power indicate regarding energy transfer?	Power is the rate of energy transfer.
Power is measured in watts (W).	Measurement of Power
In what unit is power measured?	Power is measured in watts (W).
1 watt is equal to an energy transfer of 1 joule per second (J/s).	Relationship Between Power and Energy
What is the relationship between power and energy transfer in terms of watts and joules?	1 watt is equal to an energy transfer of 1 joule per second (J/s).
An example: a hair dryer might have a power of 1500 W, indicating it transfers 1500 joules of energy every second.	Hair Dryer Power
An example: a wind turbine has a much higher power of around 1.5 MW (megawatts), indicating it can transfer energy much faster at a rate of 1,500,000 joules every second.	Wind Turbine Power
Power is the rate at which energy is transferred, and it is measured in watts.	General Principle
What is the general principle regarding power and its measurement?	Power is the rate at which energy is transferred, measured in watts.
The process of assessing and contrasting the power of different systems performing the same amount of work.	Comparing Power
What does comparing power involve, and what is the focus when systems perform the same work?	Comparing power involves assessing and contrasting the power of different systems that perform the same amount of work.
The equation can be used to calculate power.	Power Calculation Equation
Two motors lift 1000 kg of bricks by 50 m, doing the same amount of work.	Example Scenario
The work done or energy transferred by lifting bricks is equal to the change in gravitational potential energy.	Work Done in Lifting Bricks
How is the work done determined in lifting bricks, and what is it equal to?	The work done is equal to the change in gravitational potential energy.
Knowing the change in energy allows the calculation of power for each motor.	Energy Change Calculation
What is the significance of knowing the change in energy, and what does it enable?	Knowing the change in energy allows the calculation of power for each motor.
Motor B is considered more powerful because it completes the same work faster than motor A.	Power Comparison
In the example scenario, which motor is considered more powerful, and why?	Motor B is considered more powerful because it completes the same work faster than motor A.