How do you calculate resistance from cable length?
How do you calculate resistance from cable length?
CALCULATION OF CABLE RESISTANCE
- Hence R = 22.5/10 = 2.25 Ohms per km.
- Length of conductor = 500m =500/1000 = 0.5km.
- Therefore resistance of copper conductor = 2.25 x 0.5 =1.125 Ohms. Similarly for Aluminium,
- R = 36/S(c.s.a)
- Again S = 10mmsq.
- Hence R = 36/10 = 3.6 Ohms per km.
- Length of conductor = 0.5km.
What is the resistance of Aluminium wire?
Resistivity and Temperature Coefficient at 20 C
| Material | Resistivity ρ (ohm m) | Conductivity σ x 107 /Ωm |
|---|---|---|
| Silver | 1.59 | 6.29 |
| Copper | 1.68 | 5.95 |
| Copper, annealed | 1.72 | 5.81 |
| Aluminum | 2.65 | 3.77 |
What is the resistance of 1.5 mm 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) |
| 1.0 | 18.1 |
| 1.5 | 12.10 |
| 2.5 | 7.41 |
What is the resistance of a cable?
Resistance describes how strongly a given cable opposes the flow of an electric current, and conductance measures a wire’s ability to conduct it. There are also two physical quantities associated with them – electrical resistivity and electrical conductivity.
What is the resistance of a 5.4 m length of copper wire?
5.1×10−2Ω
What is the resistance of a 3.5 m length of copper wire?
3.3×10−2Ω
What is the resistance of 1000 feet of #6 aluminum?
Wire Resistance & Properties (AWG & Metric)
| AWG | Stranding | D.C. Resistance (Ohms/1000 feet) |
|---|---|---|
| Aluminum | ||
| 10 | solid | – |
| 8 | solid | – |
| 6 | 7 | 0.808 |
Does copper or aluminum have a higher resistance?
Copper has a significantly lower electrical volume resistivity: 0.017241 (Ω x mm2)/m for copper, compared to 0.0282 (Ω x mm2)/m for aluminium . This difference is highly relevant for power cables.
What is the resistance of 4mm cable?
Resistance and Reactance per km of Copper and Aluminium cables
| Cable Size, S (mm2) | Single – Core Cable | Two – Core/Three Core Cables |
|---|---|---|
| R(Ω/km) @ 80°C | X(Ω/km) @ 80°C | |
| 1.5 | 24.384 | 0.118 |
| 2.5 | 14.680 | 0.109 |
| 4 | 9.177 | 0.101 |
What is R1 and R2?
For ring circuits, the resistance along the length of the ring is measured for each of the live (r1), earth (r2) and neutral cables (rn). This will show any break in the ring, or any junction where the resistance is high, for example where a cable is not properly joined.
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?