1 : an act or instance of opposing. 2 : the ability to withstand the force or effect of resistance to disease. 3 : an opposing or slowing force The car’s sleek design reduces wind resistance. 4 : the opposition offered by a substance to the passage through it of an electric current.
Table of Contents
What is resistance in physics with example?
For instance, a series circuit has the following resistors: a 6 ฮฉ, a 5 ฮฉ, and an 8 ฮฉ resistor. The total resistance in a series circuit is given by R1 + R2 + R3. R = 6 + 5 + 8. R = 19 ฮฉ If you are not given the individual resistance values, you can use Ohm’s law and calculate the resistance using the formula: V = IR.
What is resistance in physics for kids?
Resistance – Resistance measures how well a material or object conducts electricity. Low resistance means the object conducts electricity well, high resistance means the object does not conduct electricity well.
What is the unit of resistance?
The unit of the electrical resistance, measured with direct current, is the ohm (abbreviated ฮฉ), named after the German physicist and mathematician Georg Simon Ohm (1789-1854). According to ohm’s law, the resistance R is the ratio of the voltage U across a conductor and the current I flowing through it: R = U / I.
What is resistance and its units?
Resistance is the opposition that a substance offers to the flow of electric current . It is represented by the uppercase letter R. The standard unit of resistance is ohm, sometimes written out as a word, and sometimes symbolized by the uppercase Greek letter omega. (symbol: ฮฉ)
What is the formula of resistance?
R = V รท I Question What is the resistance of the lamp? To calculate the resistance of an electrical component, an ammeter is used to measure the current and a voltmeter to measure the potential difference. The resistance can then be calculated using Ohm’s Law.
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.
Who discovered resistance?
Georg Simon Ohm had humble roots and struggled financially throughout most of his life, but the German physicist is well known today for his formulation of a law, termed Ohm’s law, describing the mathematical relationship between electrical current, resistance and voltage.
What is the SI unit for resistance in physics?
The SI unit of resistance is ohm (symbol ). One ohm is said to be that resistance of a conductor, which is offered when a current of one ampere flows in it while a potential difference of one volt is applied to it.
What is resistance and its types?
Resistance is designated with R and its unit is the ohm (ฮฉ). A resistor is a device designed to produce resistance. Resistors can be used to limit current, divide voltage, or generate heat. There are two main types of resistors: fixed and variable.
How do you write resistance?
What are the 4 types of resistance?
- objects with mass.
- inertia and momentum.
- friction.
- gravity and air resistance.
What is the total of resistance?
The total resistance of a series circuit is equal to the sum of individual resistances. Voltage applied to a series circuit is equal to the sum of the individual voltage drops. The voltage drop across a resistor in a series circuit is directly proportional to the size of the resistor.
What is called Ohm’s law?
One of the most basic and important laws of electric circuits is Ohm’s law. Ohm’s law states that the voltage across a conductor is directly proportional to the current flowing through it, provided all physical conditions and temperatures remain constant.
What can affect resistance?
Resistance is the property of the material that restricts the flow of electrons. There are four factors affecting resistance which are Temperature, Length of wire, Area of the cross-section of the wire, and nature of the material.
What is the function of resistance?
Resistance serves as an indicator that quantifies how readily current will flow in a circuit using ohms (ฮฉ) as the unit. Current increases when resistance decreases, and it decreases when resistance increases. Resistors are essential in order to ensure that current flows at the appropriate level in circuits.
Who gave Ohm’s law?
Georg Ohm, in full Georg Simon Ohm, (born March 16, 1789, Erlangen, Bavaria [Germany]โdied July 6, 1854, Munich), German physicist who discovered the law, named after him, which states that the current flow through a conductor is directly proportional to the potential difference (voltage) and inversely proportional to …
Why is Ohm’s law important?
Why Is Ohm’s Law Important? Ohm’s law is vitally important to describing electric circuits because it relates the voltage to the current, with the resistance value moderating the relationship between the two.
What is Ohm’s law triangle?
The Ohm’s Law Triangle As a quick refresher, the triangle is a visual representation of the mathematical relationship between voltage (V, sometimes represented as U or E), resistance (R), and current (I) in a circuit. This triangle is an easy tool for new engineers to remember the three main aspects of electricity.
What is the unit symbol of resistance?
ohm, abbreviation ฮฉ, unit of electrical resistance in the metre-kilogram-second system, named in honour of the 19th-century German physicist Georg Simon Ohm.
What is the SI symbol of resistance?
The SI unit of electric resistance is the ohm (ฮฉ). 1 ฮฉ = 1 V/A.
What is difference between resistance and resistivity?
Resistance is the physical property of a substance because of which it opposes the flow of current i.e. electrons. Resistivity is the physical property of a particular substance which is having particular dimensions.
What is resistance and its properties?
resistance, in electricity, property of an electric circuit or part of a circuit that transforms electric energy into heat energy in opposing electric current. Resistance involves collisions of the current-carrying charged particles with fixed particles that make up the structure of the conductors.
What are 2 types of resistance?
Resistors can be broadly of two types. Fixed Resistors and Variable Resistors.
What are the 3 types of resistance?
There are three types of resistance, Logical/Rational, Psychological/Emotional, and Sociological.