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Voltage Drop Calculator

Make use of our user-friendly Voltage-Drop Calculator to calculate the voltage drop or load current of a conductor easily. Just enter load current, conductor material, and initial voltage details in the input fields of the calculator and press the calculate button to obtain the result in a short span of time.


Voltage Drop Calculator: Are you feeling difficult to solve the voltage drop in a wire? If yes, then read this page. Here you can find the voltage drop of a conductor effortlessly by taking the help of free Voltage-Drop Calculator. In addition to the instant output, we also give the detailed explanation to compute the voltage drop. Learn more about the concept and check the solved questions

Step by Step Process to Compute Voltage Drop

The following are the simple steps to evaluate the voltage drop. Use these guiding principles and get the output in a less amount of time.

  • Check conductor length, load current, initial voltage and wire resistivity.
  • Multiply the double of load current with the length and resistivity.
  • Divide the product by the cross-sectional area of the wire to get the voltage drop.

What is Voltage Drop?

The voltage drop is defined as the reduction of voltage. It occurs when the electric current moves through passive elements of the circuit.

The elements that affect the voltage drop of a conductor is conductor material type, length of the conductor, cross-sectional area of the wire, and load current.

The formula for voltage drop is along the lines:

For DC or 1-phase AC, V = 2 * I * L * R / A / n

For 3-phase AC, V = √3 * I * L * R / A / n

Where,

V is the voltage drop

I is the load current

L is the length of the wire

R is the resistivity of the wire

A is the cross-sectional area of the wire

n is the number of conductors that are connected in parallel

Typical AWG wire sizes

AWG is a wire guage system used predominantly in North America for the diameters of round, non-ferrous and electrically conducting wire. The list of typical AWG wires and their sizes are follows:

AWG Diameter (inch) Turns of Wire (per inch) Area (kcmil) Copper resistance (Ω/km)
0000 (4/0) 0.4600 2.17 212 0.1608
000 (3/0) 0.4096 2.44 168 0.2028
00 (2/0) 0.3648 2.74 133 0.2557
0(1/0) 0.3249 3.08 106 0.3224
1 0.2893 3.46 83.7 0.4066
2 0.2576 3.88 66.4 0.5127
3 0.2297 4.36 52.6 0.6465
4 0.2043 4.89 41.7 0.8152
5 0.1819 5.50 33.1 1.028
6 0.1620 6.17 26.3 1.296
7 0.1443 6.93 20.8 1.634
8 0.1285 7.78 16.5 2.061
9 0.1144 8.74 13.1 2.599
10 0.1019 9.81 10.4 3.277
11 0.0907 11.0 8.23 4.132
12 0.0808 12.4 6.53 5.211
13 0.0720 13.9 5.18 6.571
14 0.0641 15.6 4.11 8.286
15 0.0571 17.5 3.26 10.45
16 0.0508 19.7 2.58 13.17
17 0.0453 22.1 2.05 16.61
18 0.0403 24.8 1.62 20.95
19 0.0359 27.9 1.29 26.42
20 0.0320 31.3 1.02 33.31
21 0.0285 35.1 0.810 42
22 0.0253 39.5 0.642 52.96
23 0.0226 44.3 0.509 66.79
24 0.0201 49.7 0.404 84.22
25 0.0179 55.9 0.320 106.2
26 0.0159 62.7 0.254 133.9
27 0.0142 70.4 0.202 168.9
28 0.0126 79.1 0.160 212.9
29 0.0113 88.8 0.127 268.5
30 0.0100 99.7 0.101 338.6
31 0.00893 112 0.0797 426.9
32 0.00795 126 0.0632 538.3
33 0.00708 141 0.0501 678.8
34 0.00630 159 0.0398 856
35 0.00561 178 0.0315 1079
36 0.00500 200 0.0250 1361
37 0.00445 225 0.0198 1716
38 0.00397 252 0.0157 2164
39 0.00353 283 0.0125 2729
40 0.00314 318 0.00989 3441

Example

Question: A current of 9 A flows through a circuit that carries resistance of 10 Ω and the length of the wire is 5 m. The cross sectional area of the wire is 24 sq m, find the voltage drop?

Solution:

Given that

Load current I = 9 A

Resistance R = 10 Ω

Cross-sectional Area A = 24 sq m

Wire length L = 5 m

Voltage drop V = 2 * I * L * R / A

V = 2 x 9 x 5 x 10 / 24

= 900/24

= 37.5

Therefore, the voltage drop is 37.5 V.

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FAQ's on Voltage Drop Calculator

1. How to calculate the voltage drop?

To find the voltage drop in a wire, get the product of load current, wire length, and wire resistance. Divide the product by the cross-sectional area of the wire and again divide the result by a number of conducts.


2. What influences the magnitude of the voltage drop?

The voltage drop occurs in a wire when the current has to travel along the wire. The factors affecting the voltage drop are wire material type, wire size, length of the wire and load current.


3. What is the formula for voltage drop?

The formula to calculate the voltage drop is V = 2 * I * L * R / A / n for DC or 1st phase AC and V = √3 * I * L * R / A / n for 3-phase AC.


4. How can voltage drop be reduced?

The simple steps to minimize the voltage drop is decreasing the temperature of the conductor, reducing the power load, increasing quality or increasing the conductor's size, decreasing the wire length.


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