1885 British C. Bradley invented molded carbon solid-core resistors. In 1897, British T. Gumbrell and A. Harris made carbon film resistors with carbon-containing ink. From 1913 to 1919, W. Swan in the United Kingdom and F. Kruger in Germany successively invented metal film resistors. In 1925, Germany's Siemens - Halsk company invented thermal decomposition of carbon film resistors, breaking the carbon monolithic solid core resistor market situation. After the advent of transistors, stricter requirements were imposed on resistors such as miniaturization and resistance stability, which promoted the development of various types of new resistors. The United States Bell Laboratory developed a TaN resistor in 1959. Since the 1960s, new technologies such as drum magnetron sputtering and fine tuning of laser resistance have been adopted, and some products have developed toward planarization, integration, miniaturization, and sheet form.
Resistor is generally called resistance directly in daily life. Is a current limiting component, after the resistor is connected in the circuit, the resistance of the resistor is fixed, generally two pins, which can limit the size of the current through the branch it connects to. Resistors that cannot be changed are called fixed resistors. Variable resistance is called potentiometer or variable resistor. The ideal resistor is linear, that is, the instantaneous current through the resistor is proportional to the applied instantaneous voltage. Variable resistor for voltage division. On the exposed resistor body, one to two removable metal contacts are pressed. The contact position determines the resistance between either end of the resistor body and the contact.
The terminal voltage and current have a deterministic functional relationship, which represents the two-terminal device capable of converting electrical energy into other forms. It is represented by the letter R and the unit is ohm Î©. Actual devices such as light bulbs, heating wires, resistors, etc. can be represented as resistor elements.
The resistance of a resistive element is generally related to temperature, material, length, and cross-sectional area. The physical measure of the effect of resistance on temperature is the temperature coefficient, which is defined as the percentage change in resistance at each temperature rise of 1Â°C. The main physical characteristic of a resistor is that the variable electrical energy is thermal energy. It can also be said to be an energy-consuming element through which the internal energy is generated. Resistors usually function as voltage dividers and shunts in circuits. For signals, both AC and DC signals can pass through resistors.
Made of resistive material, with a certain structure,
Can be used in the circuit to limit the current through the two-end electronic components. Resistors that cannot be changed are called fixed resistors. Variable resistance is called potentiometer or variable resistor. The ideal resistor is linear, that is, the instantaneous current through the resistor is proportional to the applied instantaneous voltage. Some special resistors, such as thermistors, varistors, and sensors, have a non-linear relationship between voltage and current. Resistors are the most commonly used components in electronic circuits, and usually form different series according to power and resistance for the circuit designer to choose. Resistors are mainly used to regulate and stabilize the current and voltage in the circuit. They can be used as shunts and voltage dividers as well as circuit matching loads. According to the circuit requirements, it can also be used for negative feedback or positive feedback of the amplifying circuit, voltage-current conversion, voltage or current protection components at input overload, and RC circuit can be formed as oscillation, filtering, bypass, differential, integral and time constant. Components and so on.
Resistor Function Small power resistors are usually made of carbon film encapsulated in a plastic case, and high-power resistors are usually wire wound resistors made by winding a large resistivity wire around a ceramic core.
If the resistance of a resistor is close to zero ohms (for example, a large cross-section wire between two points), the resistor has no hindrance to the current, and the parallel circuit of such a resistor is short-circuited and the current is infinite. If a resistor has an infinite or large resistance, the loop connected in series with this resistor can be considered as an open circuit and the current is zero. The resistors commonly used in the industry are between two extreme conditions. They have a certain resistance and can pass a certain current, but the current is not as large as when they are short-circuited. The current limiting effect of the resistor is similar to the effect of limiting the flow of water through a small diameter tube connected between two large diameter tubes. Resistance, the English name resistance, usually abbreviated as R, it is a basic property of the conductor, and the conductor size, material, temperature. Ohm's law states that I=U/R, then R=U/I, the basic unit of resistance is ohms, which is represented by the Greek letter â€œÎ©â€. It has such a definition that one ampere current is generated when a voltage is applied to a conductor. The corresponding resistance. The main function of the resistor is to hinder the flow of current. In fact, "resistance" refers to a property, and the resistance usually referred to in electronic products refers to a component such as a resistor. Ohm is often referred to as Europe. The commonly used units that represent resistance are kiloohm (kÎ©), megohm (MÎ©), milliohm (mÎ©).
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