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Electrical resistance is defined as the property of an electrical component to resist the flow of electric current. The unit of electrical resistance is ohm which is defined as volt per ampere.
- Formula For Electrical Resistance - BYJU'S
Electrical resistance is a quantity that measures the...
- Formula For Electrical Resistance - BYJU'S
- What Is Electrical Resistance?
- What Is Electrical Resistance Measured in (Units)?
- Electrical Resistance Symbol
- Electric Resistance Formula
- Electrical Resistance, Heating and Temperature
- Common Questions About Resistance
Resistance (also known as ohmic resistance or electrical resistance) is a measure of the opposition to currentflow in an electrical circuit. Resistance is measured in ohms, symbolized by the Greek letter omega (Ω). The larger resistance, the greater the barrier against the flow of current. When the potential difference is applied to a conductor, th...
The electrical resistance is measured in (the SI unit for a resistor) ohm, and Ω represents it. The unit ohm (Ω) is named honor of the great German physicist and mathematician Georg Simon Ohm. In the SI system, an ohm is equal to 1 volt per ampere. Thus, Therefore, the resistance is also measured in volt per ampere. Resistors are manufactured and s...
There are two main circuit symbols used for electrical resistance. The most common symbol for a resistor is a zig-zag line which is widely used in North America. The other circuit symbol for a resistor is a small rectangle widely used in Europe and Asia, termed the international resistor symbol. The circuit symbol for resistors is shown in the imag...
The basic formula for resistance is: 1. The relationship between Resistance, Voltage and Current (Ohm’s Law) 2. The relationship between Resistance, Power, and Voltage 3. The relationship between Resistance, Power, and Current These relationships are summarised in the image below.
Electrical Resistance and Heating
When the electric current (i.e., the flow of free electrons) passes through a conductor, there is some ‘friction’ between the moving electrons and the molecules of the conductor. This friction is referred to as electrical resistance. Thus, the electrical energysupplied to the conductor is converted into heat due to friction or electrical resistance. This is known as a heating effect of an electric current produced by electrical resistance. For example, if I amperes is flowing through a conduc...
Effect of Temperature on Electrical Resistance
The resistance of all the materials is affected by the change in temperature. The effect of the temperature change is different depending on the material.
Electrical Resistance of The Human Body
The resistance of the human body skin is high, but the internal body resistance is low. When the human body is dry, its average effective resistance is high, and when wet, the resistance reduces substantially. Under dry conditions, the effective resistance offered by the human body is 100,000 ohms, and under wet conditions or broken skin, the resistance is reduced to 1000 ohms. If high voltage electrical energy gets into human skin, then it quickly breakdown the human skin, and resistance off...
Electrical Resistance of Air
We know that the electrical resistance of any material depends on the resistivity or the specific resistance of that material. The resistivity or specific resistance of the air is around to at 200C. The electrical resistance of air is the measure of the ability of air to resist an electrical current. The air resistance is the result of collisions between the leading surface of the object and air molecules. The two main factors that affect the amount of air resistance are the speed of the obje...
Electrical Resistance of Water
The specific resistance or resistivity of water is the measure of the ability of the water to resist an electrical current, which depends on the concentration of dissolved salts in the water. Pure water has a higher value of specific resistance or resistivity as it does not contain any ions. When salts dissolve in pure water, free ions are produced. These ions can conduct an electrical current; hence resistance decreases. Water with high salt concentration has low resistivity. The table below...
R = V I. Where, Also, we can compute the electrical resistance if we know about the material of the object and its geometrical measurements. It is because of the following formula.
Electrical Resistance Formula: If we set l 1 =1 m and A 1 =1 m 2 in Equation 1, R 1 becomes ρ. Rearranging the equation gives a formula for the resistance of any conductor: \[\begin{matrix} R=\rho \frac{l}{A} & {} & \left( 2 \right) \\\end{matrix}\]
Electrical resistance is a quantity that measures the opposition offered by a device or a material to the flow of current through it. The S.I unit of resistance is ohms (Ω). A resistor is an electric component that is used to offer the desired resistance in a circuit.
The three basic principles for this tutorial can be explained using electrons, or more specifically, the charge they create: 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).
Electrical resistance is the hindrance to the flow of charge through an electric circuit. The amount of resistance in a wire depends upon the material the wire is made of, the length of the wire, and the cross-sectional area of the wire.
