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Check Your Progress 9. Electric Generator Explain how an electric generator works. 13. Frequency What changes to an electric 10. Generator Could you make a generator by generator are required to increase frequency? mounting permanent magnets on a rotating 14. Output Potential Difference Explain why the shaft and keeping the coil stationary? Explain. output potential difference of an electric generator increases when the magnetic field 11. Bike Generator A small generator on your is made stronger. What is another way to bike lights the bike's headlight. What is the increase the output potential difference? source of the energy for the bulb when you 15. Critical Thinking A student asks, "Why does ride along a flat road? AC dissipate power? The energy going into a 12. Microphone Consider the microphone lamp when the current is positive is removed when the current is negative. The net current is shown in Figure 3. What happens when the zero." Explain why this reasoning is wrong. diaphragm is pushed in