Basic Electronics title


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Slide 1

Basic Electronics Things to be covered: What is electricity Voltage, Current, Resistance Ohm’s Law Capacitors, Inductors Semiconductors Mechanical Components Digital Electronics

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What is Electricity Everything is made of atoms There are 118 elements, an atom is a single part of an element Atom consists of electrons, protons, and neutrons

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Electrons (- charge) are attracted to protons (+ charge), this holds the atom together Some materials have strong attraction and refuse to loss electrons, these are called insulators (air, glass, rubber, most plastics) Some materials have weak attractions and allow electrons to be lost, these are called conductors (copper, silver, gold, aluminum) Electrons can be made to move from one atom to another, this is called a current of electricity.

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Surplus of electrons is called a negative charge (-). A shortage of electrons is called a positive charge (+). A battery provides a surplus of electrons by chemical reaction. By connecting a conductor from the positive terminal to negative terminal electrons will flow.

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Voltage A battery positive terminal (+) and a negative terminal (-). The difference in charge between each terminal is the potential energy the battery can provide. This is labeled in units of volts. Water Analogy

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Voltage Sources:

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Voltage is like differential pressure, always measure between two points. Measure voltage between two points or across a component in a circuit. When measuring DC voltage make sure polarity of meter is correct, positive (+) red, negative (-) black.

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Exercise Measure DC voltage from power supply using multimeter Measure DC voltage from power supply using oscilloscope Measure DC voltage from battery using multimeter Measure AC voltage from wall outlet using a multimeter Measure AC voltage from wall outlet using an oscilloscope Effective or Root Mean Square Voltage (Measured with multimeter) ERMS=0.707xEA E

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Current Uniform flow of electrons thru a circuit is called current. WILL USE CONVENTIONAL FLOW NOTATION ON ALL SCHEMATICS

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To measure current, must break circuit and install meter in line. Measurement is imperfect because of voltage drop created by meter.

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Resistance All materials have a resistance that is dependent on cross-sectional area, material type and temperature. A resistor dissipates power in the form of heat

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Various resistors types

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When measuring resistance, remove component from the circuit.

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Resistor Color Code

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Determine the resistance of various resistors of unknown value using the resistor color code Using the multimeter, compare the specified resistance and measured resistance Using the multimeter to examine the characteristics of various potentiometers Exercise

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Ohm’s Law

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Prototyping Board Example of how components are Inserted in the protoboard

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Exercise Calculate the total current and voltage drop across each resistor shown in Figure 1 Build the circuit in Figure 1 on the prototype board Measure the total circuit current and voltage drops across each resistor and compare the calculated and measured values

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Capacitance Battery Capacitor Unit = Farad Pico Farad - pF = 10-12F Micro Farad - uF = 10-6F A capacitor is used to store charge for a short amount of time

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Capacitor Charging

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Capacitor Discharge

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