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Como realizar a leitura do valor de resistência de um resistor?
Os valores da resistência dos resistores são dados pela combinação de suas faixas coloridas.
Na imagem há dois exemplos de como efetuar essa leitura.
O resistor metal filme tem como função, a regulação precisa do nível de corrente que circula pelo circuito. Ao escolher esse equipamento, o usuário terá a garantia de segurança já que esse componente eletrônico consegue garantir que não aconteça curto circuito no ambiente. Alguns exemplos de equipamentos que utilizam esse componente são: televisores, aparelhos de DVD, rádios entre outros.
Feeding current through a 10K ohm resistor to the base (current interrupted by a switch). Live current passes through a 180 ohm resistor to the collector. So long as no current/voltage hits the base, this will result in a tiny leak, but no useful flow. Once we apply voltage to the base, we get flow out of the emitter, and we will light up the LED.
Note that with the given resistances, we apply a *small* voltage at the base, to allow a *large* voltage to flow through the transistor from collector to emitter.
Here is a close up of the ballast r. What I was saying is that I can actually turn the resistor completely over with the two connectors attached the same way (so the black would be connected to the now top 2 prongs and the white to the bottom, as before.)
Resistors & capacitors
Full description/analysis: www.eevblog.com/forum/projects/reverse-engineering-misc-a...
www.toposen.com/products/enameled-wire-thermistor.html
Details
Material: Semiconductor ceramics/epoxy/Enameled wire
Applicable temperature range：-30~90℃
Output signal: analog signal output
Advantages
1. The product is an epoxy thermistor, and there are many types of wire wound resistor
2. Good stability and high reliability
3. Wide resistance range: 2~500KΩ
4. High resistance and B value accuracy
5. Glass package, can be used under harsh conditions such as high temperature and high humidity
6. Small size, sturdy structure, easy for automatic installation
7. Operating temperature range -30~+90℃
8. Fast heat induction and high sensitivity
Application
1. Temperature control and temperature detection of household appliances such as induction cooker, electric pressure cooker, rice cooker, electric oven, disinfection cabinet, water dispenser, microwave oven, electric heater, etc.
2. Temperature detection and temperature compensation of medical equipment (such as copiers, printers, etc.)
3. Temperature control and testing of industrial, medical, environmental protection, meteorological, and food processing equipment
4. Temperature protection of rechargeable battery pack and charger
5. Temperature compensation of instrument coils, integrated circuits, quartz crystal oscillators and thermocouples
General parameters
ResistanceR25℃：5K10K15K20K50K100K200K
B value(R25/R50)3380395034704200397741004200
Tolerance1%2%3%5%
Note: What is the B value:
A material constant that describes the resistance-temperature relationship. The value of B can reflect the scale of resistance to temperature change between two specific temperatures. As the temperature changes, the resistance value of a product with a large B value under the same conditions changes more, that is to say, it is more sensitive.