Power - Physics 101 / AP Physics 1 Review with Dianna Cowern

The video explores the concept of power, defined as energy per time, using various examples such as solar power plants, light bulbs, and human bodies. It explains the difference between energy and power, and how power is measured in watts. The video also covers practical applications like hydroelectric power at Niagara Falls and provides a problem-solving example involving force and velocity. Additionally, it touches on the efficiency of energy use in different scenarios and concludes with interesting facts about plasma.

What is the main focus of today's lesson in Diana's physics class?

• The concept of energy

• The concept of power

• The concept of force

• The concept of velocity

Which unit is used to measure power?

• Pascal

• Joule

• Newton

• Watt

How much power does an incandescent light bulb typically use?

• 100 watts

• 60 watts

• 7 watts

• 2 watts

What is the approximate power output of the human body?

• 50 watts

• 500 watts

• 100 watts

• 200 watts

What is the change in potential energy when hiking up two hills of the same height?

• Different for each hill

• More for the steeper hill

• Less for the steeper hill

• The same for both hills

What unit do power companies use to measure energy usage?

• Kilowatt

• Kilowatt-hour

• Joule

• Watt

What is the power output of Niagara Falls?

• 1.4 terawatts

• 1.4 gigawatts

• 1.4 megawatts

• 1.4 kilowatts

What is the average power usage of a home in the US?

• 1500 watts

• 1000 watts

• 500 watts

• 1200 watts

In the problem-solving example, what was the mistake in the initial power calculation?

• Incorrect mass value

• Incorrect velocity value

• Incorrect force value

• Incorrect time value

What happens to the spring constant when a spring is cut in half?

• It remains the same

• It becomes zero

• It halves

• It doubles