Resistance is the opposition to the flow of electrons (i.e. electrical current) in a conducting material such as a metal wire or a pair of contacts in a switch. Every substance has a certain amount of resistance. Resistance is measured in ohms. If one volt can push 1 amp of current through a substance, it has a resistance of 1 ohm. Some materials, like copper and aluminum have fairly low resistance, and are therefore used as electrical conductors (wires).
Another answer
Conductor resistance means a material's opposition to the flow of current that a conductor has. Ideally, in a wire, this should be nothing, i.e. 0 ohms, but in reality all conductors have a certain amount of resistance. For example, 1000 feet of 14 AWG (the common wire size used for 15 amp branch circuits in residential wiring in North America) has about 2.5 ohms of resistance.
Further answers
Think of a conductor as a resistor/resistance of a certain very low value in series with whatever load it is feeding. Current flowing through the conductor(s) will result in a voltage drop and power loss, manifested as heating of the conductors. The "line loss" formula is one variation of the power formula and is P = I2 x R, which can be used for calculating the power loss in the conductors. Remember that any power line to a 120 volt device has 2 lengths of conductor going to it (hot and neutral return). Therefore the total conductor length is the length of the power cord or electrical cable times 2.
To calculate the voltage drop across the conductor resistance for a given current, you have to determine the conductor's resistance and use Ohm's law.
Calculating the resistance of a length of conductor can be done using tables readily available in textbooks or via a websearch, assuming copper conductors at 20 degrees Celcius. You need to know the size of the conductor (AWG size, for American wire gauge) and the length of the conductor.
The units of resistance in an electrical circuit are measured in ohms ().
Electrical current is measured in amperes (A), voltage is measured in volts (V), and resistance is measured in ohms (Ω). Power is measured in watts (W), and energy is measured in kilowatt-hours (kWh).
Resistance is the measure of how much a material or component opposes the flow of electric current. In electrical terms, resistance is defined as the ratio of voltage to current in a circuit, measured in ohms.
An ohmmeter measures electrical resistance. This is one part of "impedance", that prevents electricity from flowing freely from one part of a circuit to another. Resistance is measured in "ohms".
Resistance in electrical circuits is caused by the interaction of electrons with the atoms in a material, which slows down the flow of electric current. This resistance is measured in ohms and can be influenced by factors such as the material of the conductor, its length, and its cross-sectional area.
The units of resistance in an electrical circuit are measured in ohms ().
Electrical resistance is measured in Ohms.
Electrical conductance is the reciprocal of resistance and is measured in siemens (symbol: S).
an ohm meter OR multimeter is used to measure the electrical resistance...
Electrical current is measured in amperes.
Resistance, or electrical resistanceResistance, or electrical resistanceResistance, or electrical resistanceResistance, or electrical resistance
The three electrical quantities are current voltage and resistance. Current is measured in amperes (A) and is the rate at which electricity flows through a conductor. Voltage is measured in volts (V) and is the electrical force pushing the current through the conductor. Resistance is measured in ohms () and is the opposition to the flow of current. Current - measured in amperes (A) Voltage - measured in volts (V) Resistance - measured in ohms ()
Ohm
Electrical resistance, measured in Ohms
Electrical current is measured in amperes (A), voltage is measured in volts (V), and resistance is measured in ohms (Ω). Power is measured in watts (W), and energy is measured in kilowatt-hours (kWh).
Voltage (V) is measured in volts.Current (I, uppercase i) is measured in amps (amperes).Resistance (r) is measured in ohms.
Electrical resistance, measured in Ohms