## 1.WHAT IS A RESISTOR?

**WHAT IS A RESISTOR ? **

A resistor is an electrical object that does nothing to create resistance to the flow of electrical energy. Almost all electrical networks and electrical circuits can be found. Resistance is measured in ohms. The ohm resistance occurs when a single ampere current passes through a resistor with a single volt dropping in its terminals. At the moment it is like an electric current across the end. This measure is represented by Ohm’s law.

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Resistors are used for many purposes. A few examples include delimiting current flow, power dissipation, heat generation, circuit modification and loading, control gain, and adjusting time zones. They are available for sale at resistance prices in excess of orders of more than nine sizes.

They can be used as electric brakes to dissipate kinetic energy in trains or to be smaller than a square of an electronic millimeter. A resistor is an idle electrical component with the primary function of reducing the flow of electrical energy. The international IEC symbol is a rectangular shape. In the USA the ANSI rate is very common, which is the zigzag line.

**WHAT IS A RESISTOR**

### ELECTRICAL RESISTIVITY AND RESISTANCE

Electricity reductions are a measure of a commodity to resist the flow of electricity. This is expressed in Ohm-meters (Ω⋅m). The symbol of resistivity is usually the Greek letter ρ (rho). A high drop means that the object is not moving properly. Electrical failure is defined as the relationship between the electric field within an object, and the electrical potential of it as a result.

**WHAT IS A RESISTOR**

In ρ there is an objection to the object (Ωm), E is the magnitude of the electric field in the object (V / m), J the magnitude of the electric field in the object (A / m2). If the electric field (E) through an object is too large and the current flow (J) is too small, it means that the object has a high resistance. Resistor Guide www.resistorguide.com | Principle 10 Electricity generation is the transformation of resistance, and is a measure of how well an asset operates on energy:

where σ is the performance of Nokia product per meter (S / m). In electrical engineering κ (kappa) is often used instead of σ.

### ELECTRICAL RESISTANCE

Electrical resistance is shown in **Ohms** and is not the same as resistivity. While resistivity is a material asset, resistance is the substance of an object. The electrical resistance of the resistor is determined by the combination of the condition and the resistance of the object.

**WHAT IS A RESISTOR**

For example, a wirewound resistor with a long, thick wire has a high resistance then for a short and thin wire. A wire-wound resistor made of a material with high resistivity has a high resistance value and then a low resistivity. A simulation of a hydraulic system can be made, in which water is pumped through a pipe. If the pipe is long and narrow, the height will be greater. A sand-filled pipe will withstand the flow of water over sandless sand (protective material).

### WIRE RESISTANCE

The resistance value of a wire depends on three parameters: resistivity, length and diameter. The formula for calculating wire resistance is as follows

**WHAT IS A RESISTOR**

Where R is the resistance (), the resistance of the material (Ωm), l is the length (m) of the material, and A is the cross-sectional area (m2) of the material. The resistance value of the wire depends on three parameters; Its resistivity, cross-sectional area and length. A l The Resistor Guide www.resistorguide.com | Fundamentals 12 For example, consider a wirewound resistor with a resistance of nichrome with a resistance of 1.10 × 10−6 ofm. The length of the wire is 1500 mm and the diameter is 0.05 mm. Resistance value is calculated with these three parameters.

### SHEET RESISTANCE

The resistance value for the sheet is calculated in the same way as for the wire resistance. The cross-sectional area can be written as the product of W and t: For some applications such as thin films, the ratio between resistivity and film thickness is set at a sheet resistance of

Of this, Rs. The film thickness should be uniform for this calculation. Resistor Guide www.resistorguide.com | Fundamentals 13 t w l Resistance can be increased by cutting a pattern on the sheet. The electrical resistance of the sheet depends on the length, width, film thickness, and resistivity. Often resistor manufacturers increase the resistance by cutting a pattern in the film to increase the path of the current flow.

### RESISTIVE PROPERTIES OF MATERIALS

Electrical resistance is shown in Ohms and is not the same as resistivity. While resistivity is a material asset, resistance is the substance of an object. The electrical resistance of the resistor is determined by(WHAT IS A RESISTOR) the combination of the condition and the resistance of the object. For example, a wirewound resistor with a long, thick wire has a high resistance than for a short and thin wire.

A wire-wound resistor made of a material with high resistivity has a high resistance value and then a low resistivity. (WHAT IS A RESISTOR)A simulation of a hydraulic system can be made, in which water is pumped through a pipe. If the pipe is long and narrow, the height will be greater. A sand-filled pipe will withstand the flow of water over sandless sand (protective material).

- WHAT IS A RESISTOR?
- ELECTRICAL RESISTIVITY AND RESISTANCE
- ELECTRICAL RESISTANCE
- WIRE RESISTANCE
- SHEET RESISTANCE
- RESISTIVE PROPERTIES OF MATERIALS

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