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The power rating of the resistor only tells the amount of power it's able to
dissipate without overheating, melting, or exploding. The amount of power
that a resistor dissipates is determined by its resistance and the current
through it (or voltage across it).
If you put a small resistor at a place in the circuit where it must dissipate more
power than it's rated for, then it'll overheat and possibly fail.
If you put a high power resistor at a place in the circuit where it dissipates much
less power than it's rated for, then nothing happens at all. It simply takes up
more space on the board than was necessary, because it's bigger than what
was needed there, and you spent more money than you needed to spend for
the kind of resistor that you needed at that place in the circuit.
What else can I help you with?
How is the resistor behaved at high frequency?
The major problem with resistors at high frequencies is for wire-wound (power) resistors, that will act as inductors at high frequencies. In addition, very small resistors, like chip resistors, can also exhibit capacitive effects. Special high frequency resistors are designed to offset these effect.[1]
What type of resistors carry relatively high electric currents?
Power resistors are designed to carry high electric currents due to their ability to dissipate heat effectively. These resistors are commonly used in applications where high power levels need to be handled, such as in power supplies, industrial equipment, and power electronics. They often have a large physical size and are built to withstand the heat generated by the current passing through them.
What are the types of resistor?
There are many types of Resistors , which can be classified in many ways. The fundamental classification is based on the Power Handling Rating , which breaks up into Power Resistors & Low power resistors. Power Resistors can handle large Powers & Currents. These are generally made of High Resistance alloys like Nichrome , which are used in heaters , toasters etc. Some types of small power resistors are also used in electronic circuits which handle large currents like in power supplies etc. Infact the incandescent lamp is a special form of power resistor. Low power resistors are usually used in electronic circuitry , which again have different power capacity ratings usually less than 1watt to small surface mounted devices which are rated for few tenths of milliwatts. Another important classification is based on the stability of the resistor material & hence its ohmic values. Such resistors are used for precision applications like measuring circuits , meters etc. Then there are specialised forms of clasification depending on application e.g Positive & Negative Temeprature coefficient resistors ( Thermistors ) are used for temperature sensing , Voltage Dependent resistors are used in protection circuitry, High Voltage resistors are used where requires for high voltage ( kilovolts ) electronic circuitry like X Ray , Laser & Electrostatic Power supplies.
Why are resistors called resistors?
Resistors have resisting power(resists the electric power).Due to having the resistive property, the name resistor is given to such electrical device.
Do additional resistors affect power?
Of course. Additional resistors change total resistance, which changes current, which affects power.
Why do some resistors so much larger than other?
Resistors vary in size primarily due to their power ratings and intended applications. Larger resistors can dissipate more heat without overheating, making them suitable for high-power applications. Additionally, size can also be influenced by construction materials and design; for example, wire-wound resistors tend to be larger than film resistors due to their manufacturing processes. Ultimately, the size of a resistor is determined by the balance between its electrical characteristics and thermal management needs.
Why does the fan work only on high and keep blowing resistors on low?
Had one that the fan motor was going bad Was burning out resistors with high draw
What are the types of carbon film resistors?
Carbon film resistors come in several types, primarily differentiated by their construction and performance characteristics. The most common types include standard carbon film resistors, which offer good stability and low noise, and high-precision carbon film resistors, designed for applications requiring tighter tolerances. Other variations include low-temperature coefficient (LTC) carbon film resistors, which minimize changes in resistance with temperature, and power carbon film resistors, built to handle higher power ratings. Each type is suited for different applications based on factors like accuracy, stability, and power handling capabilities.
Five series resistors each dissipate 50 mW of power What is the total power?
AS:total power = P1 + P2 + P3 + .......so,total power = 5(50mW)= 0.25Wtotal power dissipated by the five resistors is 0.25W.
How much power does a string of 6 4.5v 40ma led's consume?
The total power of a series of resistors is equal to the sum of the power dissipated by individual resistors. In this case, each resistor consumes 4.5v*.04amps which is equivalent to 1.08 watts. Since there are 6 resistors, 6.48 watts of power are consumed.
What will happen if resistors are connected in DC motor?
The value and kind of resistors, connected in series or paralell, type of dc motor, what is the purpose, etc.
What is carbon composition resistors?
Carbon composition resistors are resistors that are made with carbon or graphite mixed with a binding material. It's one type of resistors among several. There are also carbon-film resistors and metal-film resistors. Out of all the resistors, carbon-film resistors have the greatest tolerances and changes to temperature fluctations. Thus, they are used in applications where precision isn't critical and where temperature will not change drastically.
