Electronics Section 2 Robotics, Electronics, and Fluid Power

Objectives By the end of the unit, the students will be able to: 1. State what Electronics are 2. State why Electronics are important 3. Demonstrate how to draw an Electronics System 4. Demonstrate how to wire an Electronics System 5. State what resistors are and how to read them 6. State what capacitors and transistors are and what function they have

What are Electronics What is Electronics? Answer: Electronics is electronic components, integrated circuits and electronic systems used to make such devices as miniature electronics circuits and wireless technology

Why are Electronics important Why are Electronics important Electronics are important because they allow us to perform various tasks just by pushing a button or turning a knob. Sensors now allow equipment that could hurt someone to sense them and shut off. The cars are equipped with electronics like airbag systems, ABS brakes, anti spinning system and burglar alarm. Modern electronics have also revolutionized medical diagnosis by introducing new techniques like ultrasonic imaging systems

Drawing a Electronics System Just like Pneumatics, Electronics uses symbols to represent different pieces and currents. You have to talk the system out to make sure you aren’t forgetting anything or overloading the system. Just like Pneumatics, Electronics uses symbols to represent different pieces and currents. You have to talk the system out to make sure you aren’t forgetting anything or overloading the system.

Resistors Resistors are like check valves in a Pneumatic system. They limit or prevent flow of electricity through the system in one direction but allow it to flow freely in the other. The difference is that a resistor provides resistance to the system only allowing a certain amount of electricity to flow through so as not to short circuit the system. Resistors are read using different colors and will be explained on the following pages. Resistors are like check valves in a Pneumatic system. They limit or prevent flow of electricity through the system in one direction but allow it to flow freely in the other. The difference is that a resistor provides resistance to the system only allowing a certain amount of electricity to flow through so as not to short circuit the system. Resistors are read using different colors and will be explained on the following pages.

Resistors BlackBrownRedOrangeYellowGreenBlueVioletGrayWhite

Reading Resistors Match first color with Match first color with first number Match second number with Match second number with second color Third color tells you how Third color tells you how many zeros to add at end

Examples Blue, Red, Blue = 62,000,000 Ohms or 62M Ohms Blue, Red, Blue = 62,000,000 Ohms or 62M Ohms 530 Ohms = Green, Orange, Brown color code 530 Ohms = Green, Orange, Brown color code

Capacitors A capacitor is a storage device in an electronics system. It is kind of like a short term battery that only holds a little amount of electricity. It cannot produce electrons, rather just store them. A capacitor is measured in Farads, Microfarads, and Picofarads. The more Farads the more watts your system can handle. For example, a 2 Farad capacitor can handle 2000 watts. A 1 Farad capacitor can handle 1000 watts. The difference between a Capacitor and a Battery is a capacitor will dump its entire charge in under a second where a battery takes minutes to completely discharge. A capacitor is a storage device in an electronics system. It is kind of like a short term battery that only holds a little amount of electricity. It cannot produce electrons, rather just store them. A capacitor is measured in Farads, Microfarads, and Picofarads. The more Farads the more watts your system can handle. For example, a 2 Farad capacitor can handle 2000 watts. A 1 Farad capacitor can handle 1000 watts. The difference between a Capacitor and a Battery is a capacitor will dump its entire charge in under a second where a battery takes minutes to completely discharge.

Capacitor cont’d The capacitor in its simplest form consists of 2 metallic plates that are close to each other but are not touching. The material that separates the metallic plates is called a dielectric and can be ceramic, air, Mylar film, Tantalum and even a paste substance known as electrolyte. The capacitor in its simplest form consists of 2 metallic plates that are close to each other but are not touching. The material that separates the metallic plates is called a dielectric and can be ceramic, air, Mylar film, Tantalum and even a paste substance known as electrolyte.

Capacitor symbol with battery

Capacitor with Light Bulb You can connect this system up until the light bulb goes out then remove the battery. Replace the battery with a wire and the bulb will go on for as long as the capacitor holds its energy.

Transistors The Transistor is a 3 lead device having a Base, Collector, and Emitter. By applying the correct polarity across these leads you can cause the transistor to amplify weak signals, switch higher circuit loads with a small signal input, and perform various functions for the circuit it is used in. The Transistor is a 3 lead device having a Base, Collector, and Emitter. By applying the correct polarity across these leads you can cause the transistor to amplify weak signals, switch higher circuit loads with a small signal input, and perform various functions for the circuit it is used in.

Ohm’s Law Voltage = E Current = I Resistance = R Ohm’s Law states that: Voltage (E) = Current (I) x Resistance (R) Current (I) = Voltage (E) / Resistance (R) Resistance (R) = Voltage (E) / Current (I)