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Basic EE

Basic EE. Theory. Practice. Power supply Breadboards Resistor code Multimeters. Charge Current Voltage Resistance. Theory: Charge. A property of particles that experience electromagnetic force Two kinds of charge: positive and negative

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Basic EE

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  1. Basic EE Theory Practice Power supply Breadboards Resistor code Multimeters • Charge • Current • Voltage • Resistance

  2. Theory: Charge • A property of particles that experience electromagnetic force • Two kinds of charge: positive and negative • Force due to charge obeys an inverse square law • Charge is measured in coulombs • Electrons and protons each have the same size charge (but of opposite polarity) • Charge magnitude = 1.6 * 10-19coulombs

  3. Theory: Current • Current is charge in motion • Most of the time we think about electrons moving • through metallic wires • The flow rate of charge is measured in couloumbs/second • or Amperes (Amps) • charge/time = couloumbs/sec = Amperes • 1 Amp = 1/1.6 * 1019 electrons / sec

  4. Theory: Voltage • Voltage is the driving force behind current • Voltage is the electrical potential energy a charge has due to • its position in space • potential energy per unit of charge • "path independent“ • Voltage is measured in Joules/Coulomb or Volts (V) • Voltage is defined such that negatively charged particles are • pulled towards higher voltages • Potential energy can be converted into other forms of energy

  5. Theory: Resistance • Resistance is a property of materials • Resistors are electrical components with known resistance • Resistor code • Resistors convert voltage to heat • Ohm's law describes the relationship between voltage and current flow through a resistor • V = I R • V is the voltage across the resistor • I is the current flowing through the resistor • R is the resistance (depends upon the material) • Resistance is measured in Ohms, Ω

  6. Practice: Power Source

  7. Practice: Breadboard

  8. Practice: Resistor Code

  9. Practice: Multimeters Voltage: An across measurement: Current: A through measurement: More detail on using multimeters

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