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 an easy definition for resistance?
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.
What is resistance and its unit?
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: Ω)
What is resistance of a conductor in physics?
Resistance is defined as the property of a conductor to resist the flow of charges through it. The resistance of conductor is numerically given as the ratio of potential difference across its length to the current flowing through it.
What is the formula resistance?
The formula to calculate the resistance using Ohm’s Law is given as follows: R = V I. where, R is the resistance of the resistor R in ohms (Ω) V is the voltage drop in the resistor in volts.
What is resistance and example?
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 resistance class 10 short answer?
Resistance is defined as the property of the conductor which opposes the flow of electric current. It is also defined as the ratio of the voltage applied to the electric current flowing through it.
Is resistance a unit?
The SI unit of resistance is Ohm(Ω), named after Georg Ohm. If 1 A of current flows through the ends of a conductor when the two ends are kept at 1 V of potential difference, the resistance of the conductor is defined as 1 Ohm.
Is Ohm’s law is universal law?
No. Ohm’s law is not a universal law. This is because Ohm’s law is only applicable to ohmic conductors such as iron and copper but is not applicable to non-ohmic conductors such as semiconductors.
What is the SI unit of specific resistance?
The SI unit of specific resistance is ohm meter (Ωm).
What causes resistance?
cause of the resistance of a wire: Resistance of a given conducting wire is due to the collisions of free electrons with each other, the ions or atoms of the conductor and the walls of the conductor during their drift towards the positive end of the conductor which in turn depends upon the arrangements of atoms in the …
What is the difference between conductor and resistance?
Electrical conductivity is the ability of a material to conduct an electrical current. Conductor resistance is the inherent resistance to current flow in a conductor. The more electrically conductive a material is the less resistance it offers to current flow.
What is resistance in electric current?
Resistance is the opposition that a substance offers to the flow of electric current. It is represented by the uppercase letter R.
Is Omega the last letter?
Omega (uppercase Ω, lowercase ω) is the 24th and last letter of the Greek alphabet. In the Greek numeric system, it has a value of 800. Pronounced [ɔ:] or ‘aw’ as in ‘raw’.
What is the symbol of diode?
The basic schematic symbol for a diode looks like an arrow head that points in the direction of conventional current flow from its Anode (A) terminal to its Cathode (K) terminal. The schematic symbol of a diode also shows that if forward-biased, current will flow through the direction of the arrow.
What is the symbol for power?
As technology became more ubiquitous, these English words were replaced with the universal symbols line “|” and circle “◯” (typically without serifs) to bypass language barriers. This standard is still used on toggle power switches.
What is resistance in Ohm’s law?
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). Ohms are named after Georg Simon Ohm (1784-1854), a German physicist who studied the relationship between voltage, current and resistance.
How do you write resistance?
What is resistance class 11?
The property of a conductor by virtue of which it opposes the flow of electric current through it is called resistance. It is given by the ratio of voltage applied to the electric current which flows through it. R = V/I.
How do you find resistance physics?
- To find the resistance of a component, you need to measure:
- The resistance is the ratio of potential difference to current.
- For example, 3 A flows through a 240 V lamp.
- resistance = 240 ÷ 3 = 80 Ω
- If you plot a graph of current against potential difference for a wire, you get a straight line.
What is the use of resistance?
They can be used not only to control the flow of current, but also to distribute voltage in a circuit. Electronic circuits need resistors in order to operate under appropriate conditions. Resistors are made of materials that resist the flow of electricity as it passes through them.
What is the name of the resistor?
Carbon Resistors are the most common type of Composition Resistors. Carbon resistors are a cheap general purpose resistor used in electrical and electronic circuits.
What are the 4 types of resistors?
- Fixed Value Resistors. These are the predominant type of resistor configuration, and as the name suggests, they have a fixed resistance value.
- Variable Resistors.
- Resistor Networks.
- Carbon Film Resistors.
- Metal Film Resistors.
- Wirewound Resistors.
- Metal Oxide Resistors.
- Metal Strip Resistors.
Why resistor is used in circuit?
A resistor is a two-terminal electrical component that provides electrical resistance. In electronic circuits, resistors are predominantly used to lower the flow of current, divide voltages, block transmission signals, and bias active elements.
What is resistance in series Class 10?
When two or more resistors are connected in series: The current through the circuit remains the same. The potential difference becomes sum of the individual potential difference across each resistor. Equivalent resistance of the circuit is the sum of individual resistances.