How do you find the cross-sectional area of copper wire?
ρ=RAl. The cross-sectional area of the wire A is the area of a circle of radius r, or of diameter d = 2r: A=πr2=π(d2)2.
How do you calculate cross-sectional resistance?
resistivity = resistance × area / length 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.
What is the resistance of a 5.4 m length of copper wire 1.5 mm in diameter?
5.1×10−2Ω
What is the resistance of a 3.5 m length of copper wire 1.5 mm in diameter?
3.3×10−2Ω
Which conductor has less resistivity?
The Resistivity of Various Materials A material with low resistivity means it has low resistance and thus the electrons flow smoothly through the material. For example, Copper and Aluminium have low resistivity. Good conductors have less resistivity. Insulators have a high resistivity.
What material has the highest resistance to electricity?
The most extensively used high working temperature resistance materials are alloys of nickel, chromium and iron called Nichrome and alloys of aluminium, iron and chromium.
What material has lowest electrical resistance?
copper
What is the lowest resistance metal?
silver
How much is too much resistance in a wire?
resistance of wiring should ideally be zero. the DMM puts out so little current that even a wire with every strand but one broken should read close to zero. maybe one or two tenths of an ohm, tops. as stated, bending should not matter.
What is the resistance of a short circuit?
In circuit analysis, a short circuit is defined as a connection between two nodes that forces them to be at the same voltage. In an ‘ideal’ short circuit, this means there is no resistance and thus no voltage drop across the connection. In real circuits, the result is a connection with almost no resistance.
Will current flow if there is no resistance?
Short version: Yep. That’s what a short circuit is. Typically, you will get current to flow as long as it has a path with finite resistance (even zero), a voltage difference, and a supply of charge carriers (e.g., electrons). But when it’s just the wire, you can’t ignore its resistance.
Can a circuit have zero resistance?
In principle, a circuit with infinite resistance has infinite current. However, no actual circuit has zero resistance. Instead, the wires and the power source each have some resistance.
What happens when resistance is 0?
In the context of any two terminals of a circuit: A short circuit implies that the two terminals are externally connected with resistance R=0 , the same as an ideal wire. This means there is zero voltage difference for any current value. (Note that real wires have non-zero resistance!)
What does it mean to have zero resistance?
Zero resistance means an infinite time constant – the current does not decay, but persists indefinitely (or as long as the material remains superconducting).