Circuit Variable

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Circuit Variable

• Chapter 1.1 1.6

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• Very Important
• Please read your text book!

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Electrical Engineering Overview

• Electrical Engineering is the profession
  concerned with systems that produce, transmit,
  and measure electrical signals.
• Five major classes of electrical systems
• Communication Systems
• Control Systems
• Power Systems
• Signal Processing
• Computer Systems

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ENIAC - ENIAC (Electrical Numerical Integrator
And Calculator) 1945, was originally developed
during Word War II but the war ended before the
machine was operational. But it continued to be
used after the war, performing calculations for
among other things, the design of the hydrogen
bomb, weather predictions, cosmic-ray analysis,
thermal ignition, random numbers, and wind-tunnel
design. The ENIAC contained 17,468 vacuum tubes,
along with 70,000 resistors, 10,000 capacitors,
1,500 relays, 6,000 manual switches and 5 million
soldered joints. It covered 1,800 square feet of
floor space, weighed 30 tons, and consumed
160,000 Watts of electrical power, making the
lights go dim in Philadelphia each time it was
powered up.
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Doug Engelbart invented the computer mouse in
1963-64 as part of an experiment to find better
ways to point-and-click on a display screen. The
casing was carved out of wood. It had only one
button, which was all there was room for. "It
was nicknamed the mouse because the tail came out
the end," Engelbart revealed about his invention.
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Stereo Amplifier
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Circuit Theory

• The electric circuit is common to all of these
  systems.
• An electric circuit is a mathematical model that
  approximates the behavior of an actual electrical
  system.

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Electric Circuit Assumptions

• Electrical effects happen instantaneously
  throughout a system.
• The net charge on every component in the system
  is always zero
• This is not magnetic coupling between the
  components in a system.

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International System of Units

• Please review this section and cover the rules
  for use in the book on page 8.