An overhead transmission cable for electrical power is 2000 m long and consists of two parallel copper wires, each encased in insulating material. A short circuit has developed somewhere along the length of the cable where the insulation has worn thin and the two wires are in contact. As a power-company employee, you must locate the short so that repair crews can be sent to that location. Both ends of the cable have been disconnected from the power grid. At one end of the cable (point A ), you connect the ends of the two wires to a 9.00-V battery that has negligible internal resistance and measure that 2.86 A of current flows through the battery. At the other end of the cable (point B ), you attach those two wires to the battery and measure that 1.65 A of current flows through the battery. How far is the short from point A ?
An overhead transmission cable for electrical power is 2000 m long and consists of two parallel copper wires, each encased in insulating material. A short circuit has developed somewhere along the length of the cable where the insulation has worn thin and the two wires are in contact. As a power-company employee, you must locate the short so that repair crews can be sent to that location. Both ends of the cable have been disconnected from the power grid. At one end of the cable (point A ), you connect the ends of the two wires to a 9.00-V battery that has negligible internal resistance and measure that 2.86 A of current flows through the battery. At the other end of the cable (point B ), you attach those two wires to the battery and measure that 1.65 A of current flows through the battery. How far is the short from point A ?
An overhead transmission cable for electrical power is 2000 m long and consists of two parallel copper wires, each encased in insulating material. A short circuit has developed somewhere along the length of the cable where the insulation has worn thin and the two wires are in contact. As a power-company employee, you must locate the short so that repair crews can be sent to that location. Both ends of the cable have been disconnected from the power grid. At one end of the cable (point A), you connect the ends of the two wires to a 9.00-V battery that has negligible internal resistance and measure that 2.86 A of current flows through the battery. At the other end of the cable (point B), you attach those two wires to the battery and measure that 1.65 A of current flows through the battery. How far is the short from point A?
A student reaches to open a door and gets a small electric shock. She knows that the
shock is caused by static electricity, but it seems like in the winter she gets shocked more
than in the summer. The student asks her science teacher if there are times of the year
when there is more static electricity that builds up than other times of the year. The
teacher replies that there is, and it depends on the humidity, or moisture in the air. The
more humid the air is, the less static will build up and, therefore, the less you get
shocked.
Explain why static electricity does not build up as much when the air is humid. In your
response, be sure to include:
• an explanation of static electricity is formed.
• an explanation of why the student felt a shock when reaching for the door
handle.
an explanation of how moisture in the air allows static electricity to dissipate.
A student reaches to open a door and gets a small electric shock. She knows that the shock is caused by static electricity, but it seems like in the winter she gets shocked more than in the summer. The student asks her science teacher if there are times of the year when there is more static electricity that builds up than other times of the year. The teacher replies that there is, and it depends on the humidity, or moisture in the air. The more humid the air is, the less static will build up and, therefore, the less you get shocked.
Explain why static electricity does not build up as much when the air is humid. In your response, be sure to include:
an explanation of static electricity is formed.
an explanation of why the student felt a shock when reaching for the door handle.
an explanation of how moisture in the air allows static electricity to dissipate.
Be sure to consider the completeness of your response, supporting details, and accurate use of terms.
Cylindrical-conductors has inner and outer
radii of
2 mm and 100 mm, respectively. If V(p = 2 mm)
= 150 V and V(p = 100 mm) = 0 V, Ɛr = 10,
%3D
dielectric conductivity 5x10-4 s/m, the dielectric
resistance equals to
803.96 2
1024.59 2
1153.66 2
1245.23 2
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DC Series circuits explained - The basics working principle; Author: The Engineering Mindset;https://www.youtube.com/watch?v=VV6tZ3Aqfuc;License: Standard YouTube License, CC-BY