The technical definition is "Electrical resistance is a ratio of the degree to which an object opposes an electric current through it, measured in ohms." In simplfied terms, electrical resistance is broadly equivalent to friction in a mechanical system. If you applied a voltage to a circuit with zero resistance then you would get an infinite current. In reality all circuits have some resistance which limits the current. We can predict the current in a given circuit using Ohms law: V = I x R Where: V is Voltage (measured in Volts) I is current (measured in Amps) R is resistance (measured in Ohms)
Resistance :-
Resistance of circuit is opposition offered to flow of current by that circuit.
Causes:
1. it opposes the flow of current
2. it ipposes the voltage
3. it protect the electrical component.
4. it protect from any electrical hazards
Not really, resistance is mostly centralised to one area of the circuit where the lower the resistance the lower the voltage but higher the amps. Resistance can be caused by many things such as a larger piece of wire in place of a thinner piece, or a broken wire replaced by a connector. These increase the resistance because there are things in the way of the current.
It doesn't necessarily have any purpose. It is a natural feature of any circuit, and caused by the length, cross-sectional area, and resistivity of the conducting material. In other words, it exists, whether we want it or not! Ideally, it would be a good thing if resistance didn't exist in supply cables, as it causes a voltage drop along the cable, and is responsible for energy losses.
'Resistors', on the other hand, are circuit components having specific values of resistance, which can be added to a circuit in order to modify the natural resistance of that circuit.
The resistance of a circuit is the total opposition offered to the flow of electric current.
The correct term is Ohm
WIKI Ohms law for a complete explanation.
Resistors limit current flow.
A cold circuit
well a voltmeter measures AC and DC voltage. resistance is a term used only for DC voltage, A voltmeter uses a term called Impedance for AC, without it, when you measure across two terminals it would create a short circuit and would blow up the meter. it is basically a safety feature to prevent people from creating short circuits when measuring.
Current
The influence of a coil of wire upon an alternating current passing through it, tending to choke or diminish the current, or the similar influence of a condenser; inductive resistance. Reactance is measured in ohms. The reactance of a circuit is equal to the component of the impressed electro-motive force at right angles to the current divided by the current, that is, the component of the impedance due to the self-inductance or capacity of the circuit.
'VA', or more correctly, V.A, is not an electrical 'term'. Rather, it is the symbol for 'volt ampere', the unit of measurement for a quantity called 'apparent power'. This is the product of the supply-voltage and load current for an a.c. load.
Ohms Law
Ohm is a unit of measurement for resistance. The term ohm was named after a German physicist named Georg Simon Ohm.
i dont know really, thats why im asking right
I have never heard of an electrical term "build" in an electrical circuit.
The abstract noun for the verb resist is the noun resistance (opposition, opposing force). As an electrical term, resistance is a property of the molecules of a substance, or their particular effect in a circuit.
ohm
we can calculate the current in a commmon electrical circuit by this formulae i.e,I=V\R where i is the current flowing in the conductor, R is resistance , V is the voltage.. THE FORMULA IS CORRECT but the term conductor does not suffice an explanation since a conductor is low in resistance R= resistance not conduction.
Ohm's Law. According to Ohm's law V = iR where V is voltage (usually measured in volts) between two points of the circuit i is current (usually measured in amperes) between two points of the circuit R is resistance (usually measured in Ohms) between two points of the circuit.
the load
Voltage.
It is a unit of measurement to measure the resistance an object possesses when electricity flows through it.
Ohm is a unit used for measuring electrical resistance.