a.a. Which of the following statements about grounding electrode conductors is true? A. They restrict the ground connection. B. They eliminate potential differences between conductive objects and the Earth electrode. C. They facilitate operation of overcurrent protective devices. D. They perform bonding between the Earth and grounded conductors. a.b. Which of the following formulas would you use to find current? A. R = E ÷ I B. I = R × E C. I = E ÷ R D. E = I × R

Q: An aluminium rod with square cross section is 1.3 m long and 3.8 mm on edge (1) What is the…

A: Given Data: l=1.3mArea of the corss section = (3.8mm)2=14.44*10-6 m2ρ(AL) = 2.75 *10-8ρ(cu) = 1.69 *…

Q: Good conductors have many loosely bound O a. Atoms O b. Protons O c. Molecules O d. Electrons

A: A good conductor of electricity must have a large number of loosely bound electrons that can…

Q: Calculate the resistivity of a copper conductor having a length of 3 km and a cross-section of 32…

A: So we have to find the resistivity of the given conductor.

Q: .When current flows through a conductor connected to a DC source, what flows through the entire…

A:

Q: 4. You have two cylindrical conductors each one meter long. One is made of aluminum with a radius of…

A: Given, LAl=1 mLCu=1 mrAl=1 mm=1×10-3 mρAl=2.8×10-8 ΩmρCu=1.7×10-8 ΩmV=10 VI=10 A

Q: Find the conductance of a 500 ft long #12AWG wire made up of copper

A: Given data: Length of the wire l=500 ft The material of the wire: Copper The wire is of type #12…

Q: Wire to be used in buildings and homes in the United States is standardized according to the AWG…

A: A: To calculate the expression of diameter of the wire, simple the expression of gauge number using…

Q: Determine the percentage increase in resistance of a copper conductor drawn such that its diamter…

A:

Photoelectric

The photoelectric effect occurs when light (or similar incident radiation, including X-rays) falls on material together with a metal plate and causes it to emit electrons. The discovery of the photoelectric effect led to important new theories (and to a Nobel Prize for Albert Einstein). Photoelectric cells, or photocells, are utilized in burglar-alarm light detectors and garage-door openers (each employs a through-beam of light this is broken when something movements throughout it), and also to play soundtracks on film movies (in which a light beam shines through the soundtrack encoded at the film and is "read" with the aid of the photocells).