The resistor is the part of an electrical circuit that resists, or limits, the power of an electrical current in a circuit. The resistor also helps to reduce, or lessen, the amount of electricity moving through the circuit.
Table of Contents
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 resistance in physics in simple words?
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 (ฮฉ).
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 a resistor Class 3?
Resistor is defined as. A passive electrical component with two terminals that are used for either limiting or regulating the flow of electric current in electrical circuits. The main purpose of resistor is to reduce the current flow and to lower the voltage in any particular portion of the circuit.
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 รท 3 = 80 ฮฉ
- If you plot a graph of current against potential difference for a wire, you get a straight line.
Why do we use 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.
How do you write resistance?
What is the use of resistance?
Because of the nature of generating heat when conducting current, resistors are used in a heater, toaster, microwave, electric stove, and many more heating appliances. In a light bulb, the metal filament glows white-hot due to the very high temperature produced from the resistance when electricity is passed through it.
What is the Ohm’s law for kids?
Ohm’s law describes the way current flows through a resistance when a different electric potential (voltage) is applied at each end of the resistance. One way to think of this is as water flowing through a pipe.
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.
What are resistors made of?
Resistors can be constructed out of a variety of materials. Most common, modern resistors are made out of either a carbon, metal, or metal-oxide film. In these resistors, a thin film of conductive (though still resistive) material is wrapped in a helix around and covered by an insulating material.
What is a sentence for resistance?
He went without resistance. The girl yesterday offered no resistance. The same way he wore down her resistance before. The reminder of what he was made her angry and bolstered her resistance.
What is an example of resistance in science?
For example, a wire’s resistance is higher if it is long and thin, and lower if it is short and thick. All objects resist electrical current, except for superconductors, which have a resistance of zero.
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 are resistors give two examples?
Answer. A resistor is a device that shows resistance of a passage of electric current. For example, ohmic resistors. Resistors can be of a fixed value, for example: 100 Ohms, (100ฮฉ) or variable as in 0 to 100ฮฉ.
What is difference between resistance and resistor?
Resistance is the property of a conductor, which determines the quantity of current that passes through it when a potential difference is applied across it. A resistor is a electrical componet with a predetermined electrical resistance, like 1 ohm, 10 ohms 100 ohms 10000 ohms etc.
What is a Class 10 resistor?
Answer: A resistor is an element or component which reduces the electrical current and supply the electricity to the electrical or electronic goods in a controlled manner.
What causes resistance in a circuit?
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 resistance of a wire?
The resistance of a wire is directly proportional to its length and inversely proportional to its cross-sectional area. Resistance also depends on the material of the conductor. See resistivity. The resistance of a conductor, or circuit element, generally increases with increasing temperature.
What is the resistance formula?
The electrical resistance of a circuit component or device is defined as the ratio of the voltage applied to the electric current which flows through it: If the resistance is constant over a considerable range of voltage, then Ohm’s law, I = V/R, can be used to predict the behavior of the material.
What will happen if 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). That final energy is usually what is dissipated as heat or other types of energy by the circuit.
What affects resistance in a circuit?
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.
How does resistance affect current?
How does resistance affect current? Current is inversely proportional to resistance, expressed as Iโ1R I โ 1 R . This means that as the resistance increases, current decreases, and if the resistance decreases, current increases.
How do you read resistance?
