How do you calculate resistance of a cable?
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 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 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 |
How much resistance is in a wire?
Common Wire Gauges
| AWG wire size (solid) | Diameter (inches) | Resistance per 1000 ft (ohms) |
|---|---|---|
| 24 | 0.0201 | 25.67 |
| 22 | 0.0254 | 16.14 |
| 20 | 0.0320 | 10.15 |
| 18 | 0.0403 | 6.385 |
What is the resistance of a 5.4 m length of copper wire?
5.1×10−2Ω
How do you calculate cable reactance?
Inductive reactance XL equals 2π times the product of the frequency of the current and the inductance of the conductor, simply XL = 2πfL. Inductive reactance is expressed in ohms. (The unit of frequency is hertz, and that of inductance is henry.)
What is the insulation resistance of a cable?
The insulation resistance is the resistance in ohms of wires, cables and electrical equipment. It is important to guard against electric shocks and avoid equipment damage from accidental discharges. The method of measuring the insulation resistance is to test and assess the state of the isolation (head and body.)
What is the resistance of 14 gauge wire?
Gauge, weight, circular mils and electrical resistance in copper wire.
| AWG Gauge* | Area (Circular Mils) | Electrical Resistance (Ohms/1000 ft) |
|---|---|---|
| at 77oF (25oC) | ||
| 12 | 6530 | 1.62 |
| 13 | 5180 | 2.04 |
| 14 | 4110 | 2.58 |
What is R1 and R2?
R1 = resistance of phase conductor ie Live. R2 = resistance of cpc ie earth.
What is an R1 R2 reading?
For each outlet on a circuit, the resistance of both the live and earth conductors together (R1+R2) is measured back to the source. This test also helps identify polarity problems – for example, if a live wire has accidentally been switched with a neutral wire somewhere in a circuit.
What is the resistance of a bad wire?
Place the negative meter lead to one end of the wire and the positive end to the other end of the wire. If the resistance reads “0” then the wire is bad.
What is the resistivity of copper wire?
Resistivity and Temperature Coefficient at 20 C
| Material | Resistivity ρ (ohm m) | |
|---|---|---|
| Copper | 1.68 | x10-8 |
| Copper, annealed | 1.72 | x10-8 |
| Aluminum | 2.65 | x10-8 |
| Tungsten | 5.6 | x10-8 |