2006-11-27 02:39:07 · 8 answers · asked by NB 2 in Science & Mathematics ➔ Physics
I mean electric resistance, doing this for coursework so please try to be helpful. Thanks!
2006-11-27 02:39:51 · update #1
Electrical resistance is a measure of the degree to which an object opposes the passage of an electric current. The SI unit of electrical resistance is the ohm. Its reciprocal quantity is electrical conductance measured in siemens.
The quantity of resistance in an electric circuit determines the amount of current flowing in the circuit for any given voltage applied to the circuit.
where
R is the resistance of the object, usually measured in ohms, equivalent to J·s/C2
V is the potential difference across the object, usually measured in volts
I is the current passing through the object, usually measured in amperes
For a wide variety of materials and conditions, the electrical resistance does not depend on the amount of current flowing or the amount of applied voltage. V can either be measured directly across the object or calculated from a subtraction of voltages relative to a reference point. The former method is simpler for a single object and is likely to be more accurate. There may also be problems with the latter method if the voltage supply is AC and the two measurements from the reference point are not in phase with each other.
more:http://en.wikipedia.org/wiki/Electrical_resistance
2006-11-27 02:41:33 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Electric resistance means the objects which cannot pass the electric power for example the piece of wood has Electric resistance.
2006-11-27 02:41:56 · answer #2 · answered by siva_kum 3 · 0⤊ 0⤋
Resistance is the opposition that a substance offers to the flow of electric current. ... In general, when the applied voltage is held constant, the current in a direct-current (DC) electrical circuit is inversely proportional to the resistance. ... The electrical resistance per unit .
https://www.electrikals.com/
2016-01-05 15:58:31 · answer #3 · answered by shaun 4 · 0⤊ 0⤋
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2016-12-17 17:04:37 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Electrical resistance?
The relationship for voltage and current in a circuit that that follows E=IR.
2006-11-27 02:43:42 · answer #5 · answered by Anonymous · 0⤊ 1⤋
Resistance: to resist current from flowing thru the object..formual v/i = r
v = volt, i = current, r= resistance.
base on the formula, higher the resistance, lower the current
2006-11-27 02:42:08 · answer #6 · answered by Failure 2 · 0⤊ 0⤋
The opposition to electron flow. The opposite of conduction.
2006-11-27 02:41:44 · answer #7 · answered by Anonymous · 0⤊ 0⤋
for example! when you have 12 volt! and want to power a 3volt LED, you can use it! but there are alot of kind.
2006-11-27 02:42:41 · answer #8 · answered by Professional 3 · 0⤊ 1⤋