What has the highest resistivity?
What has the highest resistivity?
Resistivity and Temperature Coefficient at 20 C
| Material | Resistivity ρ (ohm m) | Temperature coefficient α per degree C |
|---|---|---|
| Silver | 1.59 | .0038 |
| Copper | 1.68 | .00386 |
| Copper, annealed | 1.72 | .00393 |
| Aluminum | 2.65 | .00429 |
What material has the highest electrical resistance?
silver
What material has lowest electrical resistance?
copper
Is resistivity the same as resistance?
Resistance is defined as the property of the conductor which opposes the flow of electric current. Resistivity is defined as the resistance offered by the material per unit length for unit cross-section. The SI unit of resistivity is Ohm.
Which has more resistivity copper or manganin?
Manganin is an alloy of Cu with manganese and nickel. Since the latter two metals have resistivity greater than copper, the pure copper has lower resistivity and the manganin thus has to be thicker to have the same resistance.
Which wire is thicker copper or Nichrome?
Nichrome has more resistivity than copper. Hence for equal length and resistance it has to to be thicker since resistance is inversely proportional to the diameter of the wire.
Why do alloys have high resistivity?
Free electrons are scattered off imperfections and alloys have many more of them than pure metals. The higher resistivity in alloys as compared to the constituents is caused by an additional scattering mechanism of the electrons called “alloy scattering”. So there is a small relaxation time and hence large resistivity.
Which will produce more heat Nichrome or copper?
Nichrome and copper wires of same length and same radius are connected in series. Current is I passed through them. Thus nichrome wire will produce more heat.
Why does Nichrome wire gets heated first?
Nichrome wire gets heated up more. So more the resistance of a wire, more will be heat generated in it. Hence, we can say nichrome wire gets more heated up as compared to the copper wire.
Is Nichrome or copper a better conductor?
Copper was the best conductor because it had more free electrons. The electrons in the copper wire came up against fewer resistances while flowing in the current, than in the nichrome wire. Resistance is the result of energy loss as heat. There are fewer atoms so the electrons can flow more easily.
Which one is better conductor Nichrome or chromium?
Since, iron has lower resistivity than mercury therefore, iron is a better conductor than mercury….
| Class | Substances | Resistivity (in ohm m) |
|---|---|---|
| Alloys (Conductors) | Nichrome (Ni 60%, Cr 12%, Mn 2%, Fe 26%) | 100 x 10–6 |
| Semiconductors | Germanium Silicon | 0.46 2.300 |
Is Nichrome a good conductor?
Nichrome is a good conductor, being a metal having resistivity much higher than all insulators. However, its resistivity is much higher than copper or aluminium, which makes resistance from this metal large enough to get a workable value in very small dimensions.
What is the cost of Nichrome wire?
Nichrome 21 SWG Wire for Heating Elements, 3 m
| M.R.P.: | ₹ 300.00 |
|---|---|
| Price: | ₹ 78.00 |
| You Save: | ₹ 222.00 (74%) |
| Inclusive of all taxes |
Is Nichrome wire toxic?
It is totally safe and it can resist the most heat…. making it physically safer too. Nickel-Oxids are not good. Of course we would get only tiny amounts…but there is no need whatsoever to use Ni-Chrom anyway.
What does Nichrome symbolize?
NiCr
What is Nichrome wire used for?
Nichrome Wire and Ribbon (80% Ni/20%Cr). Nichrome is a non-magnetic alloy of nickel and chromium. Nichrome is widely used in heating elements. It is wound in wire coils to a certain electrical resistance, and current passed through to produce heat.
Why does a wire made of Nichrome glow while as a copper wire does not?
The heating element of an electric heater is made of an alloy which has high resistance whereas the cord is made of copper metal which has very very low resistance…now,the heating element of an electric heater made of nichrome glows because it becomes red hot due to the large amount of heat produced on passing …
Why Nichrome is used in heater?
Nichrome, a non-magnetic 80/20 alloy of nickel and chromium, is the most common resistance wire for heating purposes because it has a high resistivity and resistance to oxidation at high temperatures. When used as a heating element, it is usually wound into coils.
Can we use copper wire instead of Nichrome in meter bridge?
Can we use copper wire instead of Nichrome in meter bridge? Copper cannot be used as a meter bridge wire because it has low resistance and high-temperature coefficient of resistivity.
Does Nichrome have high melting point?
Nichrome is characterised by a silver-grey colour and has a high resistance to electrical flow and heat. It is also very resistant to corrosion and wear, is very durable and has a very high melting point at around 1,400oC. Its resistance to oxidation make nichrome a popular material for use in heating elements.
Why Nichrome wire is not used in bulb?
Nichrome wire, an alloy of nickel and chromium, and often iron (or other elements) is good for making heaters but not lamps. At rated voltages, nichrome will glow orange-red, not the bright white that is needed for illumination. If you increase the voltage to get a brighter color, the nichrome will burn open (melt.)
What are the advantages of Nichrome?
Because of its low cost of manufacture, strength, ductility, resistance to oxidation, stability at high temperatures, and resistance to the flow of electrons, nichrome is widely used in electric heating elements in applications such as hair dryers and heat guns.
Is Nichrome used in fuse?
nichrome has a high melting point due to which it is not used as a fuse wire .. if it will be used then the current through circuit will flow and can damage our home appliances….
Which wire is best for fuse?
The material used for making fuse element has a low melting point such as tin, lead, or zinc. A low melting point is, however, available with a high specific resistance metal shown in the table below. The material mainly used for fuse element are tin, lead, silver, copper, zinc, aluminum, and an alloy of lead and tin.
Which wire is used in heater?
Nichrome
Which wire is best for house wiring?
Havells flexible cables and wires are best in class in the flexible cables category and also the range includes flame retardant low smoke cables, multicore round cables, coaxial cables and heat resistant flame retardant cables.