Journeyman Electrician Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

What is the approximate voltage drop on a circuit 200 feet away from the panelboard using size 3 AWG copper conductors with a 80-ampere load?

5.00 volts

6.50 volts

7.84 volts

To determine the approximate voltage drop on a circuit using size 3 AWG copper conductors with an 80-ampere load over a distance of 200 feet, it is essential to understand how voltage drop is calculated.

The formula for voltage drop in a circuit is given by:

\[ V_{drop} = \frac{2 \times K \times I \times L}{1000} \]

where:

- \( V_{drop} \) represents the voltage drop in volts,

- \( K \) is the resistivity constant for the conductor material (for copper, it is typically 12.9 ohms per mil foot),

- \( I \) is the current in amperes,

- \( L \) is the one-way length of the circuit in feet.

Using this formula, for a circuit length of 200 feet (which means 400 feet total for the round trip), with an 80-amp load, the calculation would look like this:

1. Determine K for copper: \( K = 12.9 \, \text{ohm} \cdot \text{mil} \cdot \text{ft} \).

2. Plug the values into the formula:

- \( V

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8.40 volts

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