You Measure It.
how to calculate area of a wire
To calculate the area of a multi-strand wire you use the formula D = square root of (4S divided by pi), where S equals the number of strands times the area of one strand.
To calculate the resistance of a single core wire, you will need to know the resistivity of the material the wire is made of, the length of the wire, and the cross-sectional area of the wire. You can use the formula: Resistance = resistivity * (length / cross-sectional area). Plug in the values for the resistivity, length, and cross-sectional area to find the resistance of the 70mm^2 single core wire.
To calculate the new conductance, simply multiply the initial conductance by the change in area: 100 S * 23 = 2300 S. Since the length of the wire is reduced by the same amount as the area is increased, the overall conductance remains the same.
If the wire has a circular cross-section - the usual case - use the formula for the circle: pi x radius squared.
There is no formula to calculate the length of a wire. The length of a wire is determined by the distance from the power source to where the load is situated.
A wire with the same resistance as the given copper wire would have the same resistivity as copper. The resistance of a wire is dependent on its resistivity, length, and cross-sectional area. To calculate the resistance of a wire, use the formula R = (resistivity * length) / area; however, without the specific resistivity value, an exact value cannot be provided.
Find the wire from the secondary of the transformer. If it's a step-down transformer the thicker wire is the secondary. Measure its diameter in inches and calculate its cross-section area in square inches. The current rating for transformer wire is 1000 amps per square inch, or 1.55 amps per square mm.
A Vernier caliper, or a micrometer can measure diameter real well, and from that it's easy to calculate area.
To calculate the length of the wire needed, you first find the cross-sectional area of the wire using the formula for the area of a circle (A = πr^2), where the radius is half the diameter. Then, you can calculate the length using the formula R = ρ * (L/A), where R is the resistance, ρ is the resistivity of aluminum, L is the length of the wire, and A is the cross-sectional area. Substituting the values of 1 ohm for resistance, 2.59mm for diameter, and 2.8x10^-3 ohm m for resistivity, you can solve for the length of wire needed.
length x width = area
The resistance of a wire is inversely proportional to the cross-sectional area of the wire. This means that as the cross-sectional area of the wire increases, the resistance decreases, and vice versa.