Recap I Lecture 22 - Cornell Universityliepe/webpage/docs/... · Alternating current (ac):...
Transcript of Recap I Lecture 22 - Cornell Universityliepe/webpage/docs/... · Alternating current (ac):...
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© Matthias Liepe, 2012
Recap I Lecture 22
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Recap II
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Today:
• Energy density of a magnetic field
• Alternating current and power
• Transmission lines and transformers
• Ideal LC circuit
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i (increasing)
R
L
b i
i i
L
RL circuit: Power supplied and dissipated in the circuit
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At time t 0 the switch is moved to position a.
i
R
L
b
a
i
i i
L
After t 0, how does the power delivered to the inductor’s magnetic field vary with time?
A. It starts low & steadily increases.
B. It starts high & steadily decreases.
C. It starts low, then increases until it reaches a
peak, & then decreases.
D. It’s constant. E. It oscillates.
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Why is power transmitted at very
high voltages in power transmission
lines (several 100,000 volts)?
A. Because it reduce the energy lost in long-
distance transmission
B. Because it maximized the power that can be
transmitted
C. Because it is easier to generate high voltages
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Alternating current (ac):
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Electrical transmission system: