In order to understand the physical processes, engineers still use the screens of oscilloscopes made with cathode ray tubes, doctors cannot do without x-rays, and all of us use microwave ovens, in which magnetrons produce microwave radiation used to heat food. A resistor is a passive component that is used to provide electrical resistance in electrical circuits. In addition to resistance, resistors, as a technical manifestation of the phenomenon of electrical resistance, have small capacitance called stray capacitance and small inductance called stray inductance.
In practical applications, engineers often consider the non-linearity of the current-voltage characteristic of resistors. A resistor is a device needed in every electrical circuit. Of course, we could make a circuit without them, but this would simply be a theoretical entity — practical implementations are unimaginable without resistors. An electrical engineer could call any electronic component a resistor, regardless of how it was made and designed, as long as it provides electrical resistance.
The radio operator managed to send out an SOS signal after he replaced a broken resistor with a piece of pencil lead. In the end, this saved the explorers. Resistors are important components in electronic devices and can be used as individual components or as parts of integrated circuits. Discrete resistors are classified according to their use, the type of current-voltage relationship, safety specifications, mounting method, the way their resistance changes, manufacturing specifications, and the amount of thermal emissions.
They are marked in circuit diagrams as in the image below. Resistors can be connected either in series or in parallel. When the connection is in series, the overall resistance of the circuit is the sum of resistances of each resistor:. Resistors are color-coded according to their size and use. Color coding can be done in conjunction with alpha-numeric coding, and resistors can be marked with different color stripes if they are meant as discrete components.
A given symbol can mark decimal points. Ohms are marked as R and E, kiloohms — as K, and megohms — as M. For example, 3R3 means 3. Small resistors used as discrete components are marked with color stripes in accordance with established coding tables.
We could find information on coding in books but it is much easier to find it online. Surface-mount device SMD resistors are coded with three or four digits or three symbols. The codes can be determined by checking a table or looking up this information online.
The most practical way of determining the specifications of a given resistor and checking if it is working correctly is to measure its resistance directly by using a multimeter. If you test resistors installed in a device, you must remember that you can only test resistors if your device is not powered.
Note that the results of measurements of installed resisters will be incorrect. This article was written by Sergey Akishkin. Do you have difficulty translating a measurement unit into another language? Help is available! Post your question in TCTerms and you will get an answer from experienced technical translators in minutes.
In this part of the TranslatorsCafe. The electrical resistance of a circuit component is the opposition to the passage of an electric current through that component. The ohm is defined as a resistance between two points of a conductor when a constant potential difference of 1 volt applied to these points produces a current of 1 ampere.
This online unit converter allows quick and accurate conversion between many units of measure, from one system to another. The Unit Conversion page provides a solution for engineers, translators, and for anyone whose activities require working with quantities measured in different units.
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Note: Integers numbers without a decimal period or exponent notation are considered accurate up to 15 digits and the maximum number of digits after the decimal point is In this calculator, E notation is used to represent numbers that are too small or too large. E-notation is commonly used in calculators and by scientists, mathematicians and engineers.
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This site will not work properly because your browser does not support JavaScript! Electrical Conductance and Conductivity Did you know that a common dielectric material such as glass can conduct electricity well in certain conditions? Resistors on this power supply circuit board are marked in red and make up half of its components. The resistance of electrical cables must be as small as possible. Georg Simon Ohm. Filament failure of an incandescent light bulb as it happens in the air.
A microprocessor and a video card. The flash in a xenon flash tube circled in red occurs after the gas is ionized when its electrical resistance is reduced. Its operation depends on the ionization of the gas inside of it through collision, when gamma ray photons enter it.
The resulting rapid decrease of resistance is registered by the control circuit. A plastic shower head is electroplated with chrome.
We can see a thin red layer of copper on the inner side that is not plated with chrome. Many people prefer the so-called tube sound. In this formula, P is power, measured in watts , I is the current , measured in amperes , and V is the potential difference or voltage drop across the component, measured in volts.
Knowing how much current is flowing to your load is very important in selecting the correct wire. We take the distance into consideration to calculate the voltage loss.
The other half of this calculation is the current. You need a larger wire to move more current. If you have a choice the higher voltage is best. These formulas are also useful in calculating AC alternating current wattage to determine the size of an inverter, which converts the DC electricity from a solar array to AC that can then be used to power lights and appliances in homes and businesses.
Appliances include a face plate which contains all of its electrical data. Lets suppose you have a microwave oven. The manufacturer will list an amp requirement on the electrical data of the face plate, which is usually attached to the back of the oven.
Let's say that the rating on the face plate is 8. To calculate the watts, multiply 8. This equals watts. Now, lets calculate how much power the microwave will use in one day. Ohm's Law is true for circuits that contain only resistive elements no capacitors or inductors , regardless of whether the driving voltage or current is constant DC or time-varying AC. It can be expressed using a number of equations, usually all three together, as shown below.
Power is the rate at which electrical energy is transferred by an electric circuit per unit time typically expressed in the SI International System of Units unit of Watts. Power is typically produced by electric generators and supplied to businesses and homes through the electric power industry, but can also be supplied by electric batteries or other sources.
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