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Physics

Chapter 4 - Alternating Current AC Circuits

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Chapter 5 - Dual Nature of Wave and Particle

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Chapter 6 - Atomic Spectra and X-Rays

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Chapter 7 - Lasers and Principles

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Chapter 8 - Modern Electronics and Semiconductors

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Quiz

Lesson 4: The Electric Transformer and Electric Motor (DC Motor) — Picture questions (exam style)

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1.
A 90% efficient transformer: Np = 400, Ns = 2000, primary 240 V, secondary load 20 Ω. Which option is correct?
A 90% efficient transformer: Np = 400, Ns = 2000, primary 240 V, secondary load 20 Ω. Which option is correct?
step-down, Is = 60 A, Ip = 333 A
step-down, Is = 12 A, Ip = 300 A
step-up, Is = 60 A, Ip = 333 A
step-up, Is = 60 A, Ip = 300 A