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A high-intensity desk lamp is rated at 45 W but requires

Physics: Principles with Applications | 6th Edition | ISBN: 9780130606204 | Authors: Douglas C. Giancoli ISBN: 9780130606204 3

Solution for problem 74GP Chapter 21

Physics: Principles with Applications | 6th Edition

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Physics: Principles with Applications | 6th Edition | ISBN: 9780130606204 | Authors: Douglas C. Giancoli

Physics: Principles with Applications | 6th Edition

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Problem 74GP

Problem 74GP

A high-intensity desk lamp is rated at 45 W but requires only 12 V. It contains a transformer that converts 120-V household voltage, (a) Is the transformer step-up or stepdown? (b) What is the current in the secondary coil when the lamp is on? (c) What is the current in the primary coil? (cf) What is the resistance of the bulb when on?

Step-by-Step Solution:

Step-by-step solution

Step 1 of 4

a)

  The primary voltage

    The secondary voltage

The transformer converts 120V to 12V.  Primary voltage is bigger than secondary voltage so it is step-down transformer.

Step 2 of 4

Chapter 21, Problem 74GP is Solved
Step 3 of 4

Textbook: Physics: Principles with Applications
Edition: 6
Author: Douglas C. Giancoli
ISBN: 9780130606204

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A high-intensity desk lamp is rated at 45 W but requires