Copper wire.
.wikipedia.org/wiki/Electrical_resistivity_and_conductivity
Copper wire has apparently lower resistance than the reed switch. The lower electric resistance, the higher electric current.
Reduce the resistance:-- Use a shorter piece of wire.-- Use thicker wire.-- Cool the wire.Increase the resistance:-- Use a longer piece of wire.-- Use thinner wire.-- File a nick in the piece of wire you have.-- Stretch the wire.-- Heat the wire.
Copper is used to make electrical wire because it is ductile and is very conductive. The ease with which copper can be worked and drawn ("pulled" or "stretched") into wire (because of its ductility) makes it a great mechanical choice for wire. And copper is highly conductive, that is, it has a low resistance to electric current flow. These two properties make copper an excellent choice to make electrical wire.
Resistivity allows us to compare different conductors' abilities to transmit electric current that is independent of the physical dimensions of the conductors.Resistivity is defined as 'the resistance of a unit length of a substance with a uniform cross-section'. In SI, the unit of measurement of resistivity is the ohm metre; in US customary units, it is expressed in ohm circular mil per foot.So, to finally answer your question, the resistivity of copper is 17.5x10-9 ohm metres at 20oC. To find the resistance of a copper conductor, you can then use the equation:resistance = resistivity x (area / length)Additional AnswerThe resistivity of copper depends on the temperature it which it is measured. At 25°C, it is about 17 nΩ.m, or 1.7 µΩ.cm.The resistance of a conductor is then p * L / A, where p is the above number.So for a wire with a length of 1 m (i.e. 100 cm), and a cross sectional area of 2 cm², the resistance is 17e-6 * 100 / 2 = 85 µΩ
One way to increase the strength of a copper electromagnet is by adding another coil. Another way is by wrapping the copper coil around a nail made of iron.Adding more loops to the wireWrapping the copper wire around an iron nailIncreasing the current
Copper will.
For a single temperature, yes. The copper wire will have a much smaller cross-section than the iron wire. For multiple temperatures, no. Copper and iron have different temperature coefficients for resistivity.
A wire with low resistance. To obtain the lowest resistance, the wire must be -- thick -- a good conductor; silver, copper, etc. -- cold
Aluminium wire has high resistance than Copper.
Constantan wire is a resistance-wire made of 42% nickel, 1.25% manganese, 0.25% iron and the rest is copper. It is mainly used in making wire-wound rheostats and potentiometers in electrical circuits.
Cu, Au, and Ag metals have the lowest resistivity in the metal class. The current (I) in an electric wire will experience the wire resistance (R). The result is joules heating (= I2R), which is wasted power. If R is low, then we have little waste. =======================
The copper wire has to be wound around a iron core to get the full effect of electromagnetism.
No. Other things being equal, a long wire has more resistance than a short wire.
A copper wire carrying current, Another magnet, An iron horseshoeA copper wire carrying currentAnother magnetAn iron horseshoe
Nichrome wire has such high resistance that it is used to convert electrical energy into heat. Many heating elements are made from nichrome. Copper wire has the best conductivity, for the price, of any metal.
Copper wire has low resistance, so it is unable to produce enough heat to glow.
It can't be just any metal - it has to be iron. If you wrap a copper wire around iron, and the copper wire is attached to an electricity source, you can create an electromagnet.