Quick Answer: What Is The Function Of Resistance?

How does a resistance work?

Resistance measures a materials ability to resist the flow of electrons through it.

If the width of the hose at the bottom remains the same, then by adding more water to the tank, the water through the hose flows faster.

Similarly, adding more voltage to a circuit increases the current..

What causes resistance?

An electric current flows when electrons move through a conductor, such as a metal wire. The moving electrons can collide with the ions in the metal. This makes it more difficult for the current to flow, and causes resistance.

What is the difference between voltage current and resistance?

Voltage is the difference in charge between two points. Current is the rate at which charge is flowing. Resistance is a material’s tendency to resist the flow of charge (current).

What is an example of resistance?

Resistance is defined as a refusal to give in or to something that slows down or prevents something. An example of resistance is a child fighting against her kidnapper. An example of resistance is wind against the wings of a plane.

What is the function of a resistor?

Resistor definition and symbol A resistor is a passive electrical component with the primary function to limit the flow of electric current.

What is resistance and its types?

All modern fixed value resistors can be classified into four broad groups: Carbon Composition Resistor – Made of carbon dust or graphite paste, low wattage values. Film or Cermet Resistor – Made from conductive metal oxide paste, very low wattage values.

What are four factors affecting resistance in a wire?

There are 4 different factors which affect resistance:The type of material of which the resistor is made.The length of the resistor.The thickness of the resistor.The temperature of the conductor.

How many types of resistance are there?

Resistors can be broadly of two types. Fixed Resistors and Variable Resistors. resistors. A fixed resistor is one for which the value of its resistance is specified and cannot be varied in general.

Why do we need resistance in a circuit?

In an electronic circuit, the basic function of a resistor is to limit the current to a safe value so that the associated sophisticated parts can function properly. Here R is the constant of proportionality and is known as the resistance of the resistor.

What is resistance unit?

Siemens per meterElectrical conductivityOhm meterElectrical resistivityElectrical resistance/SI units

What is resistance easy definition?

Resistance is a measure of the opposition to current flow in an electrical circuit. Resistance is measured in ohms, symbolized by the Greek letter omega (Ω). … Insulators: Materials that present high resistance and restrict the flow of electrons.

How do I calculate resistance?

If you know the total current and the voltage across the whole circuit, you can find the total resistance using Ohm’s Law: R = V / I. For example, a parallel circuit has a voltage of 9 volts and total current of 3 amps. The total resistance RT = 9 volts / 3 amps = 3 Ω.

What happens if a circuit has no resistance?

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). … Current will flow, and since the resistance is low — though not zero — you will just get a really large current.

What is the function of a diode?

The most common function of a diode is to allow an electric current to pass in one direction (called the diode’s forward direction), while blocking it in the opposite direction (the reverse direction). As such, the diode can be viewed as an electronic version of a check valve.

What are the 4 types of resistors?

Different Types of Resistors – Fixed, Variable, Linear & Non-Linear Resistors & ApplicationsCarbon 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)More items…