What is the resistance of a copper wire 200 ft long?
The calculated value of the resistance of the given copper wire is 5.17 ohm.
How do you calculate the resistance of 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.
How do you calculate the resistance of a wire?
Specific Resistance (”ρ”) is a property of any conductive material, a figure used to determine the end-to-end resistance of a conductor given length and area in this formula: R = ρl/A. Specific resistance for materials are given in units of Ω-cmil/ft or Ω-meters (metric).
How is resistance affected by the diameter of a wire?
As the diameter of the wire increases, the resistance decreases. In fact, if we double the cross-sectional area then the resistance halves. This means that resistance is inversely proportional to the area of the wire.
Does a thicker wire have more resistance?
The longer a wire is the more resistance it has due to the longer path the electrons have to flow along to get from one end to the other. The larger the cross sectional area, the lower the resistance since the electrons have a larger area to flow through. This will continue to apply no matter how thick the wire is.
Does resistance increase with diameter?
As we know that resistance of a wire is inversely proportional to the square of its diameter. Thus when the diameter of a wire is doubled (made 2 times), its resistance becomes one-fourth (1/4), and if the diameter of a wire is halved (made 1/2), then its resistance becomes four times (4 times).
How much does the resistance change if diameter is doubled?
Hence if diameter doubles, resistance becomes 1/4 times.
What happens to resistance when the conductor diameter is increased?
Resistance is directly proportional with length of conductor. Change in length to double will cause increase in resistance to twice and change in diameter to half will cause increase in resistance to four times.
What happens to resistance if length is doubled?
What happens to resistance when length is doubled? From the equation, we understand that resistance is directly proportional to the length of the conductor and inversely proportional to the crossectional area of the conductor. Doubling the length doubles the resistance.
On what factor does the resistance depend on?
The resistance of a conductor depends on the cross sectional area of the conductor, the length of the conductor, and its resistivity. It is important to note that electrical conductivity and resistivity are inversely proportional, meaning that the more conductive something is the less resistive it is.
What happens to the resistance of wire when its length is increased to twice its original length?
Answer. resistance is directly proportional to length, so resistance will also become twice.
How will the resistance and resistivity of a wire change if its length is doubled?
We know,R is directly proportional to length of the wire L,and inversely proportional to the area of cross section of the wire A. (i)When length is doubled,thr original resistance R becomes 2R,i.e.,the resistance also doubles. Hence new resistance becomes 1/4th of original R;since R is inversely related to the area A.
What happens to resistance when wire is stretched?
The resistance of a wire is inversely proportional to its area and directly proportional to its length. When the length is tripled then resistance will also become three times. If The wire is stretched 3 times the original length, the cross-section of the wire is cut to 1/3rd it’s the original cross-section.
How will the resistance change if 1 length of the conductor is doubled 2 diameter of the conductor is halved and 3 temperature is increased?
Answer. Answer: the resistance of a conductor is directly proportional to its length. so if length is doubled resistance will also get doubled i.e resistance is 4 times that of original resistance.
Why does resistivity does not depend on length and area?
It’s because resistance (R) is also a function of size. Larger cross sections have less resistance, and longer conductors have more resistance. Therefore, by multiplying resistance by area and dividing by length, you get a value for a material property (resistivity ρ) that doesn’t depend on the size of the conductor.
What will increase the resistance of a wire?
The resistance in a wire increases as: the length of the wire increases. the thickness of the wire decreases.
What length of the wire is needed to make a resistance of 4.2 ohm?
What length of the wire of specific resistance 48×10−8Ω- m is needed to make a resistance of 4. 2Ω(diameter of wire =0. 4mm)
What is the length of wire of specific resistance 48?
length of wire (Diameter 0.4 mm). [109 cm]
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.
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What will be effect on the resistivity of a conductor if the length of the conductor is made four times?
Answer. Explanation: If length is 4 times then respectively Resistance will also increase by 4 times.
Does Nichrome have high resistance?
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.
What length of copper wire of specific resistance 1.7 10 8 Ω m and radius 2 mm is required so that it’s resistance is 5 Ω?
Hence, the length of the wire is 184.7 meters. Was this answer helpful?
What will be the resistance of a copper wire of length 1’m and area of cross section 2 mm 2 given resistivity of copper is 1.7 10 (- 8 Ω m?
EXAMPLES Calculate the resistance of a copper wire of length 1 m and area of cross section 2 mm. Resistivity of copper is 1.7 x10 m. REP-(1.7x10mx A m 2x(10 ) = 8,5×10′. Solution EXAMPLE Solution A copper wire has a resistance of 0.5 0.
How do you find the resistance?
R = V ÷ I Question What is the resistance of the lamp? To calculate the resistance of an electrical component, an ammeter is used to measure the current and a voltmeter to measure the potential difference. The resistance can then be calculated using Ohm’s Law.