Nate Electrical Practice Exam 2026 - Free Electrical Practice Questions and Study Guide

Question: 1 / 400

What resistance is needed in a 220-volt circuit to limit the current to 2 amps?

55 ohms

110 ohms

To determine the resistance needed to limit the current to 2 amps in a 220-volt circuit, we can use Ohm's Law, which states that Voltage (V) equals Current (I) multiplied by Resistance (R). This can be expressed with the formula:

\[

R = \frac{V}{I}

\]

Where:

- V is the voltage in volts (220 volts),

- I is the current in amps (2 amps),

- R is the resistance in ohms.

Plugging the values into the formula gives:

\[

R = \frac{220 \text{ volts}}{2 \text{ amps}} = 110 \text{ ohms}

\]

This calculation shows that a resistance of 110 ohms is necessary to limit the current to 2 amps in a 220-volt circuit. This is consistent with Ohm's Law, which is fundamental to understanding how voltage, current, and resistance interact in electrical circuits.

Therefore, the correct answer reflects a solid understanding of these principles and accurately applies the formula to find the corresponding resistance.

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30 ohms

None of the above

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