Electronics Dan Simon Cleveland State University ESC 120

Voltage • Voltage is the amount of work needed to move an electric charge

Current • Electric current: The flow of electric charge (electrons), measured in Amperes •

Power • Power: The rate at which current flows, measured in Watts • Power

Resistors A resistor reduces the rate of flow of electric current, measured in Ohms:

Resistor Combinations Series: R = R 1 + R 2 Parallel: R = 1

Transistors can be used as electrically-controlled switches. The current through the transistor is proportional

Diodes allow current to flow only in one direction. Light-emitting diodes (LEDs) emit light.

Breadboard Internal connections in orange 13

Multimeter Measures voltage, current, and resistance. If you get unpredictable readings, check the battery!

Power Supply Regulated 5 Volt power supply: “wall wart” You need to cut off

Breadboard with connector posts, ready for power supply connections 17

LED Experiment Resistor value should be at least 400 ohms 18

Slides: 21

Download presentation

Electronics Dan Simon Cleveland State University ESC 120 Revised August 28, 2010

Voltage • Voltage is the amount of work needed to move an electric charge • High voltage in an electrical system is like high pressure in a hydraulic system • Common outlets in the United States: 120 Volts, 60 Hertz, alternating current (AC) 2

Current • Electric current: The flow of electric charge (electrons), measured in Amperes • One amp of current means a flow of one Coulomb (6. 241 × 1018 electrons) per second § Amps = Coulombs / second • High current in an electrical system is like high rate of flow in a hydraulic system 3

Power • Power: The rate at which current flows, measured in Watts • Power is the product of voltage and current § Watts = Volts × Amps • Typical power consumption § § Air conditioner: 2000 W Clock: 2 W Television: 200 W Light bulb: 100 W Ohio’s average electricity cost: 12 cents per k. W-hr 4

Resistors A resistor reduces the rate of flow of electric current, measured in Ohms: V = IR Example: If R 1 > R 2, then the current through R 1 will be less than the current through R 2 5

Resistor Combinations Series: R = R 1 + R 2 Parallel: R = 1 / (1/R 1 + 1/R 2) 6

Potentiometer Trimpot Adjuster 8

Capacitors store electrical energy 9

Transistors can be used as electrically-controlled switches. The current through the transistor is proportional to the voltage applied to the base. 10

Diodes allow current to flow only in one direction. Light-emitting diodes (LEDs) emit light. The long lead connects to the positive voltage. Current flow 11

Solderless Breadboard 12

Breadboard Internal connections in orange 13

Wire and Wire Strippers 14

Multimeter Measures voltage, current, and resistance. If you get unpredictable readings, check the battery! 15

Power Supply Regulated 5 Volt power supply: “wall wart” You need to cut off the connector so that you can connect the bare wires to your breadboard 16

Breadboard with connector posts, ready for power supply connections 17

LED Experiment Resistor value should be at least 400 ohms 18

Potentiometer Experiment 19

Motor Experiment 20

Motor Experiment 21