Understanding Power and Its Concepts

What is the definition of "Power" in physics?

• The rate at which work is done or energy is transferred.

• The ability to transform one form of energy into another.

• The speed at which an object moves.

• The efficiency of a machine.

Which of the following is an example of a machine?

• A car engine

• A lightning bolt

• A rainbow

• A sound wave

What is the SI unit of power?

• Joule

• Watt

• Newton

• Meter

How does velocity differ from speed?

• Velocity includes direction, while speed does not.

• Speed includes direction, while velocity does not.

• Velocity is always greater than speed.

• Speed is always greater than velocity.

Which equation correctly represents power in terms of work done and time?

What is the relationship between efficiency and power in a machine?

• Efficiency is the ratio of useful power output to total power input.

• Efficiency is the sum of useful power output and total power input.

• Efficiency is the difference between useful power output and total power input.

• Efficiency is unrelated to power.

Which of the following best describes the term "transform" in the context of energy?

• To change energy from one form to another.

• To increase the speed of an object.

• To measure the velocity of an object.

• To calculate the efficiency of a machine.

If a car travels 100 meters in 5 seconds, what is its speed?

• 5 m/s

• 10 m/s

• 20 m/s

• 25 m/s

How are power and velocity related in the context of a moving object?

• Power is the product of force and velocity.

• Power is the sum of force and velocity.

• Power is the difference between force and velocity.

• Power is unrelated to velocity.

Which of the following is an example of transforming energy?

• A light bulb converting electrical energy to light energy.

• A car moving at a constant speed.

• A book resting on a table.

• A person walking at a steady pace.