1. What is Voltage Drop Across a Single Resistor?

Definition: This calculator determines the voltage drop across a single resistor in an electrical circuit using Ohm's Law.

Purpose: It helps electricians, engineers, and electronics enthusiasts calculate the potential difference across a resistor given the current and resistance.

2. How Does the Calculator Work?

The calculator uses Ohm's Law formula:

Where:

• \( VD \) — Voltage drop (volts)
• \( I \) — Current through the resistor (amps)
• \( R \) — Resistance (ohms)

Explanation: The voltage drop is directly proportional to both the current flowing through the resistor and its resistance value.

3. Importance of Voltage Drop Calculation

Details: Calculating voltage drops is essential for proper circuit design, ensuring components receive appropriate voltage levels and preventing potential damage.

4. Using the Calculator

Tips: Enter the current in amps and resistance in ohms. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the relationship between current, voltage, and resistance?
A: Ohm's Law states that voltage equals current multiplied by resistance (V = I × R).

Q2: Does this calculator work for AC circuits?
A: For purely resistive loads in AC circuits, yes. For reactive components (inductors/capacitors), impedance must be considered.

Q3: What happens if resistance is zero?
A: In theory, voltage drop would be zero (short circuit). In practice, all conductors have some resistance.

Q4: How do I measure current and resistance?
A: Current is measured with an ammeter in series, resistance with an ohmmeter (with power off).

Q5: Why is voltage drop important in circuit design?
A: Excessive voltage drops can cause components to malfunction or operate outside specifications.