Engineers often ask how to calculate the resistance of a cable, there is a very simple formula that works well within an ohm or so with copper cable. 19 ÷ by 2.5mm2 will give you 7.6 ohms per km. ÷ by 1000 for resistance per meter. 19 ÷ by 4mm2 will give you 4.75 ohms per km.
What is the resistance of a copper wire 200 ft long?
The calculated value of the resistance of the given copper wire is 5.17 ohm .
What is the resistance of a long wire?
The resistance of a long wire is greater than the resistance of a short wire because electrons collide with more ions as they pass through. The relationship between resistance and wire length is proportional .
How do you calculate the resistance of a cable length?
Specific Resistance (”ρ”) is a property of any conductive material, a figure used to determine the end-to-end resistance of a conductor given length and area in this formula: R = ρl/A . Specific resistance for materials are given in units of Ω-cmil/ft or Ω-meters (metric).
What is the resistance of a 5.4 m length of copper wire?
5.1×10−2Ω
What is the resistance of a copper wire?
| Cross Sectional Area (mm 2 ) Resistance (ohm/km) | Copper Aluminum | 1.0 17.2 26.5 | 1.5 11.5 17.7 | 2.5 6.9 10.6 |
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What is the resistance of copper cable?
| Table 5.5 – Resistance per metre of copper conductors at 20°C for calculation of R1 + R2 | Conductor cross-sectional area (mm2) Resistance per metre run (m ohms / m) | 2.5 7.41 | 4.0 4.61 | 6.0 3.08 |
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Does a longer wire have more resistance?
First, the total length of the wires will affect the amount of resistance. The longer the wire, the more resistance that there will be . ... When all other variables are the same, charge will flow at higher rates through wider wires with greater cross-sectional areas than through thinner wires.
How does the resistance of a wire depends on its length?
Resistance of a wire is directly proportional to the length of the wire. The resistance of a conductor depends on the number of collisions which the electrons suffer with the fixed positive ions while moving from one end to the other end of the conductor. ... Therefore, a longer conductor offers more resistance.
What is the resistance of copper in ohms?
For example, the resistivity of copper is generally given as: 1.72 x 10 – 8 Ωm . The resistivity of a particular material is measured in units of Ohm-Metres (Ωm) which is also affected by temperature.
How much resistance should a wire have?
Ideally, the resistance should be 2000 Ω , but due to the existence of a wire, the measured resistance is 2000.01693 Ω, it’s less than 10 parts per million higher, nearly undetectable.
What is the resistance of a 3.5 m copper wire 1.5 mm in diameter?
3.3×10−2Ω
How do you calculate copper in cable?
The copper weight is calculated by the cross section of a cable x 9.6 and will be shown in kg / km. For example FLRY 1.50 mm2 has a copper weight of 14.4 kg / km (9.6 x 1.5).
Can a 3.0 mm diameter copper wire have the same resistance as a tungsten wire of the same length?
Can a 3.0-mm-diameter copper wire have the same resistance as a tungsten wire of the same length? Yes , it can.
What is the resistance of 16 gauge copper wire?
| AWG wire size (solid) Diameter (inches) Resistance per 1000 ft (ohms) | 16 0.0508 4.016 | 14 0.0640 2.525 | 12 0.0808 1.588 | 10 0.1019 0.999 |
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What happens to the resistance of a wire as its length increases?
Resistance = (Resistivity of material) *(length of material) / (cross sectional Area of material). From above equation we can say that, the resistance of wire is proportional to its length . Hence, resistance of wire will increase if length of wire is increased. So, resistance is directly proportional to length.
What type of wire would have the least resistance?
A short wire has a lower resistance than a long one*. Resistance is directly proportional to the length of the path through which current flows: R ∝ L. This means the longer the wire, the more resistance.
On what factors does the resistance of the wire depend?
The factors on which resistance of the wire depends are : (i) The length of the wire, resistance is directly proportional to the length of the wire . (ii) The cross-section of the wire, resistance is inversely proportional to the cross-section of the wire.
What happens to the resistance of a copper wire when it is heated?
As the wire gets hotter, the ions vibrate more vigorously. This makes it more difficult for electrons to pass along the wire. Hence the resistance increases .
What is the resistance formula?
If you know the total current and the voltage across the whole circuit, you can find the total resistance using Ohm’s Law: R = V / I . For example, a parallel circuit has a voltage of 9 volts and total current of 3 amps. The total resistance R T = 9 volts / 3 amps = 3 Ω.
How resistance of a wire depends on its specific resistance length and area of cross section?
Resistance increases with length and decreases with area of cross section, but specific resistance does not. It is a characteristic property of a material and in turn depends on the collisions or scattering of electrons .
What is the resistance of a 20.0 m long piece of 12 gauge copper?
So that’s 1.72 times 10 to the minus 8 ohm meters times 20.0 meters—length— multiplied by 4 divided by π times the diameter squared and this gives 0.104 ohms is the resistance of this piece of wire.
At what temperature the resistance of a copper wire will become?
4500C .
At what temperature would the resistance of a copper wire be double its resistance?
Thus the resistance of copper conductor becomes double at 256 °C .
How much copper is in a wire?
The copper content of nonmetallic (NM) cable is between 55% and 56% . Double-insulated heavy-duty home wiring.
What is the copper price today?
| Copper Spot Price Spot Change | Copper Price per Pound $4.46 -0.01 | Copper Price per Ounce $0.28 0.00 | Copper Price per Ton $8,920.00 -20.00 |
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Which copper wire would have the highest resistance?
Copper wire has a very low resistance compared to iron and is a good conductor of electricity. A long and thin wire of copper will have a higher resistance while short and thick wire will have low resistance.
How do I calculate what size wire I need?
To determine the breaker and wire size you need, divide the total watts by the voltage to find the amperage on the circuit . You can use a breaker and wire size ampacity chart to calculate the breaker and wire size you need. Each breaker size requires a different wire size based on the breaker’s ampacity.
What is the resistance of a 4.9 m length of copper wire 1.9 mm in diameter?
What is the resistance of a 4.9-m length of copper wire 1.9 mm in diameter? The resistivity of copper is 1.68×10−8Ω⋅m.
