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SWITCHING

SWITCHING. The modern computer is a digital and electronic device. Runs on flow of electrons - movement of electrons from outer valence shells on atoms Requires force/energy to pull an electron out of a shell - Electro-motive force (EMF) - Voltage

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SWITCHING

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  1. SWITCHING • The modern computer is a digital and electronic device. • Runs on flow of electrons - movement of electrons from outer valence shells on atoms • Requires force/energy to pull an electron out of a shell - Electro-motive force (EMF) - Voltage • How tightly the electrons are held determines how much voltage is needed and is quantified as resistance • Number of Electrons flowing is quantified as Amperes

  2. 0 0 5 5 • Computers are electronic switching devices • Voltage source (battery) • Meter to detect voltage differential 0 5 Short Circuit large voltage flow, but no voltage differential

  3. 0 5 Digital Switch - Transistor • Computers are constructed from transistors • Transistor are used as on-off switches (0-off, 1-on), hence binary 0 5

  4. 0 5 0 5 Transistor controlling the circuit

  5. 0 5 Measuring Output before the transistor • Acts as an invertor • No voltage on the input causes the meter to read 5 volts • A voltage on the input causes the meter to read zero 0 5

  6. A A 0 0 5 5 B B NAND – Not AND A B Out 0 0 1 0 1 1 1 0 1 1 1 0

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