GEOG 3EE3 Lecture : Electricity.docx

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yellowhound286

18 Apr 2013

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Metals: release and transmit electrons easily good conductors. Charge = coulomb = 6. 25 x 1018 electrons. Current = i = ampere = coulomb per second. Volt = 1 joule / 1 coulomb = potential difference. Generating electricity: magnetic field induced by current, current induced by magnetic field, charged particles experience force when travelling in certain directions in a magnetic field. 1 watt = 1 volt x 1 amp. Pushes steam through turbines and spins rotor through a magnetic field to generate electricity. Power output = 2. 83 x 10-4d2v3 kwh. Ac current sent to grid or to a home. Need to come up with incentive policies. Keep some nuclear and increase renewable switch coal to more cogeneration. Solar energy knocks electrons loose and creates current. Cheaper types of pv cells have less efficiency. Efficiency: double up glass layers to absorb different wave lengths too expensive. Solar-grade silicon ways to bring down cost, lower temps so cheaper to produce.

Related Questions

Just took a test and wanted to know if i got the answersright.

Consider the 5.0cm x 20cm rectangular loop of resistance R =4.0Î©immersed in a magnetic field as shown in the figure. Herean 'X'marks a magnetic field line pointing into the page. Themagneticfield line continues indefinitely to the right.

1) As the loop is pushed to the right, what is the direction oftheinduced current?
A) Clockwise
B) Counter-clockwise
C) The direction oscillates through this process
D) There is no induced current

2) Eventually, the entire loop is immersed in the magnetic field.Asit is pushed further to the right, what is the direction oftheinduced current?
A) Clockwise
B) Counter-clockwise
C) The direction oscillates through this process
D) There is no induced current

3) While the loop is still immersed in the magnetic field, thefieldswitches direction to pointing out of the page. It doessocontinuously. It starts by decreasing in magnitude, reachingzeroTesla, then reverses direction and increases in magnitude untilitreturns to full strength. The direction of the inducedcurrentduring this process
A) is clockwise
B) is counter-clockwise
C) oscillates through this process
D) There is no induced current

4) Both the initial and final magnitude of the magnetic fieldis1.3T as the field switches direction in the above process. Ifittakes 10 seconds for this to happen, the average inducedcurrentis
A) 0 A
B) 40 Î¼A
C) 650 Î¼A
D) 1.2 mA
E) 40mA

5) In another process, a constant current I is induced fortseconds. The energy dissipated by this current is
A) E=IR
B) E=IRt
C) E=IR/t
D) E=I² R
E) E=I² Rt

consider the 2 very long parallel wires shown below.

the wires carry equal currents in opposite directions and thecurrent in wire 1 is directed to the right. the wires are seperatedby distance D. 3 points are shown on the diagram
A) inside wire 1 B) located directlybewteen the 2 wires C) islocated D/2 from wire 2.

1. what is the total magnetic field at location B?

2. What is the total magnetic field at location C?

3. what is the magnetic field caused by wire 2 at A?

4. what force does wire 1 experience due to the presence of wire2? what is the mechaniam of this force?

5. what force does wire 2 experience?

6. if the current were 2 amps and the distance is 1.5 cm, whatis the force on wires 1 and 2? what is the magnetic field at C?

(a) Consider a capacitor with vacuum between its large, closely spaced, oppositely charged parallel plates. Show that the force on one plate can be accounted for by thinking of the electric field between the plates as exerting a "negative pressure" equal to the energy density of the electric field. (b) Consider two infinite plane sheets carrying electric currents in opposite directions with equal linear current densities . Calculate the force per area acting on one sheet due to the magnetic field, of magnitude , created by the other sheet. (c) Calculate the net magnetic field between the sheets and the field outside of the volume between them. (d) Calculate the energy density in the magnetic field between the sheets.

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GEOG 3EE3 Lecture : Electricity.docx

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