1. A working area with a general dimension of 24 ft by 30 ft is lighted with 10 fixtures of four F40 T10 fluorescent lamp (3550 lumens). Calculate the maintained illumination assuming that CU is 0.35 and LLF is 0.70.

1. A working area with a general dimension of 24 ft by 30 ft is lighted with 10 fixtures of four F40 T10 fluorescent lamp (3550 lumens). Calculate the maintained illumination assuming that CU is 0.35 and LLF is 0.70.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter1: Atomic Structure

Section: Chapter Questions

Problem 6RQ: How many valence electrons are generally contained in materials used for insulators?

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Concept explainers

Electrical Heating Unit

The conversion of electrical energy to heat energy is known as electric heating. The heating system that converts the electrical energy to heat energy for various application is called electrical heating unit. Electricity is employed as the firing mechanism in electric heating systems, which transforms electric current to heat. Electric heaters have heating elements in the form of electric resistors.

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2. The resistivity of a copper rod 50 feet long and 0.25 inch in diameter is 1.72 μΩ-cm at 20 ⁰C. What is its resistance at -20 ⁰C?

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