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Mini-Quiz: Hand Cranked Flashlight

by Ron Kurtus (28 January 2016)

Take this Mini-Quiz to check your understanding of the lesson material.

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1. How is the flashlight an electric machine?

The electric motor turns the crank

The crank turns the generator to create electrical power

The LEDs create light energy

2. What do the gears inside the flashlight do?

They make sure you don't turn the crank too fast

They are used to hold the unit together

They increase the rotating speed turning the generator

3. Why is a battery included?

To power the lights without having to use the crank

No one is really sure about that

To help turn the generator

If you got all three correct, you are on your way to becoming a Champion in Understanding Machines. If you had problems, you had better look over the material again.

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Understand how things work

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Resources and references

Ron Kurtus' Credentials

Websites

Mechanically powered flashlight - Wikipedia

Electrical machine - Wikipedia

Electric machine - Wikipedia

Electromechanics - Wikipedia

Machines Resources

Books

Top-rated books on Simple Machines

Top-rated books on Machines

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Questions and comments

Do you have any questions, comments, or opinions on this subject? If so, send an email with your feedback. I will try to get back to you as soon as possible.

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Machines

Mini-Quiz: Hand Cranked Flashlight

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Topics on Machines

• Overview of Machines

Simple machines

• Tools Used to Perform Simple Tasks
• Simple Machines

Mechanical advantage

• Mechanical Advantage in Machines
• Distance Mechanical Advantage
• Speed Mechanical Advantage
• Force Mechanical Advantage
• Mechanical Advantage Relationships

Levers

• Levers are Simple Machines
• Three Lever Classes
• Relationships in Levers
• Increasing Force with a Lever
• Increasing Distance Moved with a Lever
• Increasing Speed with a Lever

Ramps

• Ramps are Simple Machines
• Effect of Friction in Ramps

Other machines

• Cylinder and Piston Drive Engines
• Electrical Machines
• Hand Cranked Flashlight

Efficiency

• Efficiency of Machines
• Rollers Reduce Friction
• Bearings Reduce Friction

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Also see

• Weekly Feedback Blog
• Machines Survey Results
• Physical Science
• Astronomy
• Chemistry
• Physics

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