There are a large number of electrical components in stock form, type and size that can be purchased from a professional supplier. Products such as bulbs, buzzer and sensors are easy to buy, and prices drop as more products are purchased. Items can be matched to ensure they are the correct voltage and current ratings for the products being produced. The resistor limits the current flow around the circuit and can prevent damage to the components. The resistance used in the circuit has tolerances on the power allowed in the circuit- The smaller the tolerance, the less likely the circuit is overloaded and damaged, but the more expensive the resistance is. When reading the value of the resistor, it must be maintained with the gold or silver ribbon on the right- This is the bus. The resistor does not provide the resistor for each possible number, but only in the so-called \"preferred value. These values are represented by numbers created by the first two color bars on the resistor. curriculum-key- The first band on the left shows the first number, the second band is the second number, and the third band is the multiplier. The above picture shows yellow (4), violet (7)and red (× 100) = 47 × 100 = 47,000 ohms (Ω) What is the resistance value below the question? Reveal the answer Brown (1), black (0)and red (× 100). 10*100 = 1,000 ohms (Ω) Resistance series to choose from- The series refers to resistance tolerances. The two most common ones are called E12 and e24. The E12 and E24 series include the following priority values for resistors: The three bands of the LEDs can increase the number behind these numbers, such as 100 to 1,000 (× 10) 330 to 33,000 (× 100), etc. The tolerance of the resistance is shown as the color of the fourth stripe, usually silver or gold. The E12 series resistors feature the fourth band of silver, and the E24 series resistors feature the fourth band of gold. The tolerance of the E12 resistor is ten percent, which means that the value of the resistor can be less than or greater than ten percent, for example, the range of the 300 Ω E12 resistor can range from 270 Ω to 330 Ω. The tolerance of the E24 resistor is 5%, which means that the value of the resistor can be less than or greater than 5%, for example, the range of the 300 Ω E24 resistor can range from 285 Ω to 315 Ω. Line integrated circuit (DIL) IC package for integrated circuits (IC) Protected in a plastic case with two rows of metal legs ( That\'s why it\'s called \"binary \"). IC is usually placed in a chip holder welded to the circuit board- Each leg is numbered to determine their function. Because they are small in size and light in weight, they are usually used for computers, cameras, microwave ovens and televisions. The two-wire integrated circuit micro-controller is a controllable integrated circuit. The most common types of micro-controllers are Programmable Intelligent computers (PIC) It is possible to re-program continuously to complete various tasks, such as controlling the setting or temperature in the microwave oven, or running a specific washing cycle in the washing machine. Pictures have a variety of different memory sizes and different numbers of pins Each pin can be connected to the input or output, so the number of devices that can be connected will increase as the pin increases. The more memory or pins available, the greater the cost of the PIC. They are used in most modern electrical products, such as television and stereo micro-controllers, and can purchase mechanical components of various shapes and sizes. The chain used to turn the sprocket in items such as pulleys and bicycle wheels is sold by width and spacing ( Distance between pins). Their standard length can be adjusted by adding and removing links. The gears have many different sizes and different number of teeth. The gears have different tooth profiles that are locked together in different ways for use in cars, bicycles and clocks. The size of the gear controls the speed at which it rotates. Stock gears are sold in diameter measurements or in number of teeth. There are two main types of Springs: compression spring- Spring is hard to compress It is difficult to expand, they can be purchased with a wide variety of \"elastic\" rates and can be ordered depending on the length of the spring, the number of coils or the distance they can stretch or compress. They are usually made of hardened steel because it has the performance that is most needed to maintain the shape of the spring. Other materials such as plastic or copper can also be used. Most electronic systems use shock absorbers springsCircuit boards because they ensure a reliable connection between components. In order for the circuit to work properly, components must be connected accurately, and different types of boards can be used for different tasks. Circuit boards can be designed using computer-aided design (CAD) The program creates a circuit that can be entered into a CNC router and etched precisely to the surface. The striipboard is a copper plate that is usually used for prototyping because it is the simplest board type to create a circuit without using expensive machinery. Strip board circuits are not printed because they have pre- Track the track. Clipboard copper- In particular, the cladding board is used in small, simple electronic circuits. It is a printed circuit board in which the connection is either CNC cut with a computer (CNC) Wiring or etching on the surface using a photoresist pen. Then put it into the etching slot to keep the pen drawing area in place. It\'s a cheap way to create a circuit without using expensive materials, although it\'s not very accurate and it could be time --consuming. Circuit board, printed circuit boardPCB) Print the photosensitive layer above copper from a computer-aided design (CAD) And then exposed to ultraviolet light. The developer solution is then used to flush exposed parts, leaving only the circuits available for use. This is an accurate way to create complex and simpleto- Using the circuit board, only the copper area to which the assembly will be connected is exposed. PCB for adding elements these boards are made of glass Reinforced plastic (GRP) This material is light in weight and strong in strength. Glass fiber reinforced plastic is an insulator of electricity and can resist corrosion well. Labels are often printed on one side of the board so that each component can be placed in the correct position. Pcb can be produced in large quantity, fast and accurate, but the machines that produce pcb are expensive and therefore cost more It is effective to buy them from a professional factory.