Functions of a resistor.
- a resistor is responsible for dissipating power in the form of heat.
- In electronics, a resistor is often used to control the current. Resistors are needed to prevent short circuits.
- In the power system analysis, the resistors are not searched. This is logical because the resistors cause a loss of power in the form of heat.
- each element that conducts electricity has a resistance. The zero resistance can only be reached at absolute zero.
there are many reasons to insert a resistance in a circuit. one of the applications is the reduction of the phase difference between the voltage and the current phasors, this is mainly done so that the reactive power circulating in the circuit is as minimal as possible. It must always be borne in mind that this (reduction of the phase angle) always comes with a price, ie an increase in power losses due to the addition of resistors.
Resistance is a two-terminal passive element connected to an electrical circuit to create an electrical resistance in this circuit .. in an electronic circuit, the resistors are used to limit the current, create a loss, create a voltage drop in a circuit, used to divide the voltages, polarize active element and it can be considered as a load of an electrical circuit .
Basic function of the resistor is to provide a resistance (blocking) in the electron flow. so you can use it to control the flow of electrons, that is, you can control the current through a circuit. When you put a resistor in the path of electrons, lots of electrons appear at one end of the resistor that is much closer to the negative terminal of the battery and the other end of the resistor has a shortage of electrons, which also causes a potential difference. it can therefore be used as a potential reel. it also produces heat as a
thermal device to decrease voltage and current, for example, I’ll tell you that we have a source with an output voltage of 5 volts and 0.75 amperes and that we have indicated the input voltage or the volt max that it can take to operate above the maximum voltage can be damaged or shortened, because if we see that we drove with a maximum voltage of 3.3 volts and that we have a source voltage of 5 volts, if we connect the 5 volts directly, the led can be damaged, so we must reduce the source voltage from 5 volts to 3.3 how can we do ?. are there any electronic components to reduce the voltage? yes we are there is a resistance where by taking a resistance of 330 homs we can get a voltage of 3.3 volts from the source voltage where we can connect to led.
resistance is a material that opposes or resists something, in the case of electrical circuits, resistors are used to oppose the flow of current . now, you may be wondering why we must oppose to the flow of current? but in cases where the load connected to the output is larger, ie it attracts a higher current, if such a higher current passes through a wire, it can burn and there is a risk of short circuit in order to limit the current flow resistances used.
There are also resistors known as 0 ohm resistors that can be used as jumpers, ie to connect one electrical path to another without affecting the conductivity as it has a resistance of 0 ohm.