What does a resistor do?

Last Update: April 20, 2022

This is a question our experts keep getting from time to time. Now, we have got the complete detailed explanation and answer for everyone, who is interested!

Asked by: Miss Katlyn Mayert
Score: 4.1/5 (26 votes)

A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses.

How does a resistor actually work?

A resistor works by restricting the flow of current, it can do this in one of three ways: firstly, by using a less conductive material, secondly by making the conductive material thinner and finally by making the conductive material longer. ... You can clearly see the carbon spiral that gives the resistor its resistance.

Does resistor reduce voltage?

Voltage varies directly with current. "R" is the constant of proportionality telling how much it varies. If I add in a resistor to a circuit, the voltage decreases. If you have a resistor in a circuit, with a current flowing through it, there will be a voltage dropped across the resistor (as given by Ohm's law).

What does adding a resistor do to a circuit?

As more and more resistors are added in parallel to a circuit, the equivalent resistance of the circuit decreases and the total current of the circuit increases. Adding more resistors in parallel is equivalent to providing more branches through which charge can flow.

When should I use a resistor?

The main function of resistors in a circuit is to control the flow of current to other components. Take an LED (light) for example. If too much current flows through an LED it is destroyed. So a resistor is used to limit the current.

What is a resistor?

15 related questions found

What happens if there is no resistance in a circuit?

If there really were no resistance in the circuit, the electrons would go around the circuit, and arrive back at the beginning of the circuit with as much energy as the potential difference (the voltage). That final energy is usually what is dissipated as heat or other types of energy by the circuit.

What appliances use resistors?

Appliances such as electric heaters, electric ovens, and toasters all use resistors to turn current into heat, then using the heat lost from this resistor to warm the surrounding area.

Do resistors change voltage?

So following the law a resistor must affect both voltage and current however the reality is that it only changes one size. you also find use cases where only voltage is affected.

Does a resistor reduce amps?

A higher resistance results in a lower amperage. The resistance of a resistor is measured in ohms. A resistor works by "resisting" the flow of current through the circuit. ... Lower the circuit's amperage by adding a variable resistance device or increasing the resistance on any you already have in the circuit.

Does voltage increase with resistance?

In other words, the current is directly proportional to the voltage and inversely proportional to the resistance. So, an increase in the voltage will increase the current as long as the resistance is held constant. ... If the current is held constant, an increase in voltage will result in an increase in resistance.

Does resistor reduce current in circuit?

The resistor reduces the current, just like the narrow pipe reduces the flow rate. The current before and after the resistor is the same, just like the flow rate before and after the narrow pipe is the same. It reduces the current compared to a different circuit where the resistor is replaced with an ideal wire.

Do resistors block voltage or current?

In short: Resistors limit the flow of electrons, reducing current. Voltage comes about by the potential energy difference across the resistor.

Do resistors increase current?

Current increases!

In a series circuit, adding more resistors increases total resistance and thus lowers current. But the opposite is true in a parallel circuit because adding more resistors in parallel creates more choices and lowers total resistance. ... With less resistance, you're faced with a higher total current.

Do resistors use power?

Yes, and no. When current passes through the resistor, it generates heat and therefore wastes energy. However, if you took the resistor out (and therefore drove the LED at a higher voltage) you'd be driving more current through the circuit and thus actually burning more power than with the resister in place.

How much voltage can a resistor handle?

The maximum power drawn by the chip through the resistor (by equation #2) will be 5 * 5 / 10000 = 0.0025 W, or 2.5 mW. That's fine even the tiniest surface mount resistors. Manufacturers typically give a maximum voltage for a particular resistor range, such as 200V for a 250 mW resistor.

What do capacitors do?

capacitor, device for storing electrical energy, consisting of two conductors in close proximity and insulated from each other. A simple example of such a storage device is the parallel-plate capacitor.

Do resistors absorb current?

A resistor can absorb power, but not deliver it. ... In words, a resistor can absorb power from a circuit (by converting electrical energy into heat energy), but can never deliver power.

How do resistors reduce voltage?

This type of circuit is called a voltage divider, and is a common way to reduce voltage in a circuit.
  1. When the two resistors in the voltage divider are of the same value, the voltage is cut in half. ...
  2. For example, suppose you're using a 9 V battery, but your circuit requires 6 V.

What are the 4 types of resistors?

Different Types of Resistors – Fixed, Variable, Linear and Non-Linear Resistors & Applications
  • Carbon Composition Resistors.
  • Wire wound Resistors.
  • Thin Film Resistors.
  • Carbon Film Resistors.
  • Metal Film Resistors.
  • Thick Film Resistors.
  • Metal Oxide Resistors.
  • Cermet Oxide Resistors (Network Resistors)

How do resistors affect power?

The unit of power is the Watt (W). When the voltage is increased, the current, I, increases and the power dissipated by the resistor, R, increases. When the value of the resistor is increased, I decreases and the power dissipated by the resistor, R, decreases.

How do resistors affect current flow?

The current after a resistor is the exact same as it was before the resistor. ... If you now add a resistor in series into this circuit – the current of the circuit will be smaller. So yes, the resistor does reduce the current. (But the current flowing into the resistor is still the same as the current flowing out.)

What is resistor in simple words?

A resistor is an electrical component that limits or regulates the flow of electrical current in an electronic circuit. Resistors can also be used to provide a specific voltage for an active device such as a transistor. ... Another type of resistor is made from winding Nichrome or similar wire on an insulating form.

Is a light bulb a resistor?

The reason a light bulb glows is that electricity is forced through tungsten, which is a resistor. The energy is released as light and heat. A conductor is the opposite of a resistor.

Does a toaster have a high or low resistance?

The heart of the toaster is one or more loops of nichrome wire. This nickel-and-chromium alloy has an unusual combination of properties: it is resistant to oxidation, has high electrical resistance and has a very high melting point.

What can I use instead of resistor?

Because of this, even a good electrical conductor, such as metal wire, can be used as a resistor. Resistance can be adjusted by limiting how thick the wire is, and by increasing or decreasing the conductive path through the wire. Resistance can also be controlled by wire material.