What happens when we increase the length of wire?
When the length of wire is longer, the current has to travel more distance and face more obstacles. With the length, resistance increases. The space of the elctrons to travel increases when cross sectional area is increased.
Does copper wire have a high or low resistance?
Thicker wires will have lower resistances, but longer wires will have higher resistances. Copper has a lower resistivity and is a better conductor of electricity than iron.
Which copper wire below has the least resistance?
(b) The ranking by resistance goes as 3 > 1 > 2. Resistance increases as length increases and cross- sectional area decreases, so case 3, with the longest length and smallest cross-sectional area, has the largest resistance. Case 2 has the smallest resistance because it has the smallest length and the largest area.
What is the resistance of 12 gauge wire?
Common Wire Gauges
| 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 |
How do you calculate the resistance of a copper wire?
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 5.4 m length of copper wire?
5.1×10−2Ω
What is specific resistance and its unit?
Specific resistance is defined as “the resistance offered per unit length and unit cross-section area of that material when a known quantity of voltage applied at its end ”. The SI unit of specific resistance is Ohm-m.
What is the length of copper wire of specific resistance?
b) A wire made of a copper alloy is 5 m in length and has a cross-sectional area 1 mm2. Its resistance is 0.15 W….resistivity = resistance × area / length.
| Map of contents | Close |
|---|---|
| Copper cables | Energy efficient motors |
| 2. Electric current | 4. Electromagnetic induction |