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Thus the E6 series of standard resistor values looks as follows: 1.0 – 1.5 – 2.2 – 3.3 – 4.7 – 6.8, etc. Note also that all of these E6 values are available in powers of ten per decade as shown using the 1.5Ω standard resistor value: Value x Multiplier = Resistance. 1.5 x 1 = 1.5Ω. 1.5 x 10 = 15Ω. 1.5 x 100 = 150Ω.
Some examples of standards which describe resistor symbols: IEC 60617 (International) ANSI Y32 / IEEE 315 (US) - old. DIN 40900 (Germany) - old. AS 1102 (Australia) - old. Sometimes the symbol for a particular device is different when it is used in another field of application. For example, different symbols are used in electronics than, for ...
TypeAbbreviationRVRPhoto resistor or Light dependent ...LDRVaristor or Voltage dependent resistorVDR RV MOV- Robert Keim
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Color codes for fixed resistors - values and tolerances - online calculator. Resistors - Letters and Digit Codes Letter and digit codes to indicating resistor values.
- What Is A resistor?
- Resistor Schematic Symbols and Values
- Variable Resistors
- Power Rating of Resistors
- How Are Resistors Useful?
- “Load” on Schematic Diagrams
- Analyzing Resistor Circuits
- Resistor Materials
Special components called resistorsare made for the express purpose of creating a precise quantity of resistance for insertion into a circuit. They are typically constructed of metal wire or carbon and engineered to maintain a stable resistance value over a wide range of environmental conditions. Unlike lamps, they do not produce light, but they do...
The most common schematic symbol for a resistor is a zig-zag line: Resistor values in ohms are usually shown as an adjacent number, and if several resistors are present in a circuit, they will be labeled with a unique identifier number such as R1, R2, R3, etc. As you can see, resistor symbols can be shown either horizontally or vertically: Real res...
Variable resistors must have some physical means of adjustment, either a rotating shaft or lever that can be moved to vary the amount of electrical resistance. Here is a photograph showing some devices called potentiometers, which can be used as variable resistors:
Because resistors dissipate heat energy as the electric currents through them overcome the “friction” of their resistance, resistors are also rated in terms of how much heat energy they can dissipate without overheating and sustaining damage. Naturally, this power rating is specified in the physical unit of “watts.” Most resistors found in small el...
For a practical illustration of resistors’ usefulness, examine the photograph below. It is a picture of a printed circuit board, or PCB: an assembly made of sandwiched layers of insulating phenolic fiber-board and conductive copper strips, into which components may be inserted and secured by a low-temperature welding process called “soldering.” The...
In schematic diagrams, resistor symbols are sometimes used to illustrate any general type of device in a circuit doing something useful with electrical energy. Any non-specific electrical device is generally called a load, so if you see a schematic diagram showing a resistor symbol labeled “load,” especially in a tutorial circuit diagram explaining...
To summarize what we’ve learned in this lesson, let’s analyze the following circuit, determining all that we can from the information given: All we’ve been given here to start with is the battery voltage (10 volts) and the circuit current (2 amps). We don’t know the resistor’s resistance in ohms or the power dissipated by it in watts. Surveying our...
Resistors can be found in a variety of different materials, each one with its own properties and specific areas of use. Most electrical engineers use the types found below:
The resistor circuit symbols are usually enhanced with both a resistance value and a name. The value, displayed in ohms, is obviously critical for both evaluating and actually constructing the circuit. The name of the resistor is usually an R preceding a number. Each resistor in a circuit should have a unique name/number.
The series looks as follows: 1– 1.2 – 1.5 – 1.8 – 2.2 – 2.7 – 3.3 – 3.9 – 4.7 – 5.6 – 6.8 – 8.2 – 10 etc. All of these values can be powers of ten (1.2 – 12 – 120, etc.). While the E12 series is the most common, other series are also available. It is a good practice to specify resistors from a low series when ...
It dissipates the signal’s power within its own resistor network. The symbol of attenuator is given above. Preset Resistor. It is a variable resistor whose resistance is adjusted during manufacturing or designing of the circuit. It is not changed during normal use of the circuit. The resistance of preset resistor is changed using a screwdriver.
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