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The student engineer of a campus radio station wishes to verify the effectiveness of the lightning rod on the antenna mast (see the figure below). The unknown resistance R is between points C and E. Point E is a "true ground," but is inaccessible for direct measurement because the stratum in which it is located is several meters below Earth's surface. Two identical rods are driven into the ground at A and B, introducing an unknown resistance R. The procedure for finding the unknown resistance R is as follows. Measure resistance R₁ between points A and B. Then connect A and B with a heavy conducting wire and measure resistance R₂ between points A and C. CB X RR (a) Derive a formula for R, in terms of the observable resistances, R₁ and R₂. 3.15 Rx = (b) A satisfactory ground resistance would be Rx < 1.9 2. Is the grounding of the station adequate if measurements give R₁ = 11 2 and R₂ = 5.902? Yes No

The student engineer of a campus radio station wishes to verify the effectiveness of the lightning rod on the antenna mast (see the figure below). The unknown resistance R is between points C and E. Point E is a "true ground," but is inaccessible for direct measurement because the stratum in which it is located is several meters below Earth's surface. Two identical rods are driven into the ground at A and B, introducing an unknown resistance R. The procedure for finding the unknown resistance R is as follows. Measure resistance R₁ between points A and B. Then connect A and B with a heavy conducting wire and measure resistance R₂ between points A and C. CB X RR (a) Derive a formula for R, in terms of the observable resistances, R₁ and R₂. 3.15 Rx = (b) A satisfactory ground resistance would be Rx < 1.9 2. Is the grounding of the station adequate if measurements give R₁ = 11 2 and R₂ = 5.902? Yes No

EBK ELECTRICAL WIRING RESIDENTIAL
EBK ELECTRICAL WIRING RESIDENTIAL
19th Edition
ISBN:9781337516549
Author:Simmons
Publisher:Simmons
Chapter4: Conductor Sizes And Types, Wiring Methods, Wire Connections, Voltage Drop, And Neutral Conductor Sizing For Services
Section: Chapter Questions
Problem 34R: The marking on the outer jacket of a nonmetallic-sheathed cable indicates the letters NM-B. What...
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The student engineer of a campus radio station wishes to verify the effectiveness of the lightning rod on the antenna mast (see the figure below). The unknown resistance Ry is between points C and E. Point E is a "true ground," but is inaccessible for direct measurement because the stratum in which it is located is several meters below Earth's surface. Two identical rods are driven into the ground at A and B, introducing an unknown resistance Ry. The procedure for finding the unknown resistance Ry is as follows. Measure resistance R, between points A and B. Then connect A and B with a heavy conducting wire and measure resistance R2 between points A and C.
The student engineer of a campus radio station wishes to verify the effectiveness of the lightning rod on the antenna mast (see the figure below). The unknown resistance R is between points C and E. Point E is a "true ground," but is inaccessible for direct measurement because the stratum in which it is located is several meters below Earth's surface. Two identical rods are driven into the ground at A and B, introducing an unknown resistance R. The procedure for finding the unknown resistance R is as follows. Measure resistance R₁ between points A and B. Then connect A and B with a heavy conducting wire and measure resistance R₂ between points A and C. CB X RR₂ (a) Derive a formula for R in terms of the observable resistances, R₁ and R₂. Rx = 3.15 (b) A satisfactory ground resistance would be Rx < 1.9 2. Is the grounding of the station adequate if measurements give R₁ = 11 2 and R₂ = 5.9 ? Yes No
Transcribed Image Text:The student engineer of a campus radio station wishes to verify the effectiveness of the lightning rod on the antenna mast (see the figure below). The unknown resistance R is between points C and E. Point E is a "true ground," but is inaccessible for direct measurement because the stratum in which it is located is several meters below Earth's surface. Two identical rods are driven into the ground at A and B, introducing an unknown resistance R. The procedure for finding the unknown resistance R is as follows. Measure resistance R₁ between points A and B. Then connect A and B with a heavy conducting wire and measure resistance R₂ between points A and C. CB X RR₂ (a) Derive a formula for R in terms of the observable resistances, R₁ and R₂. Rx = 3.15 (b) A satisfactory ground resistance would be Rx < 1.9 2. Is the grounding of the station adequate if measurements give R₁ = 11 2 and R₂ = 5.9 ? Yes No
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