Generators Interactivity
Design and build a generator that will charge a smartphone.
Record Data and Observations
Part 1: Induction
1. Described what happened to the needle when the magnet moved in the coil of wire. What
happened to the needle when the magnet was not moving?
2. Describe what happened to bulb brightness when the speed of the hand crank increased.
3. Why do you think the bulb brightness changed when the crank speed changed?
Part 2: Design and Build a Generator
4. Explain why no electric current is generated until the hand crank starts to move.
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Analyze and Conclude
1. Draw Conclusions The magnet moving in the coil of wire, the hand-crank generator and
bulb, and the design-and-build generator are all examples of electromagnetic induction. In
your own words, describe what electromagnetic induction is.
2. Use Evidence Based on your results in this activity, describe what happens to the amount
of electric current generated when the number of coils of wire are increased. What happens
to electric current when the strength of the magnet increases?
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