1. What is Ohm's Law?

Ohm's Law states that the voltage drop across a resistor is directly proportional to the current flowing through it, with the constant of proportionality being the resistance. It's a fundamental principle in electrical engineering and circuit analysis.

2. How Does the Calculator Work?

The calculator uses Ohm's Law equation:

Where:

• \( \Delta V \) — Voltage drop (V)
• \( I \) — Current through the resistor (A)
• \( R \) — Resistance (Ω)

Explanation: The voltage drop is calculated by multiplying the current flowing through the resistor by its resistance value.

3. Importance of Voltage Drop Calculation

Details: Calculating voltage drop is essential for circuit design, ensuring components receive proper voltage levels, and preventing excessive power dissipation in resistors.

4. Using the Calculator

Tips: Enter current in amperes (A) and resistance in ohms (Ω). Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Does this work for AC circuits?
A: This calculator is for DC circuits only. For AC circuits, impedance and phase angles must be considered.

Q2: What if I know voltage and want to find current?
A: You can rearrange Ohm's Law: \( I = \Delta V / R \).

Q3: What are typical resistor values?
A: Resistors range from fractions of an ohm to millions of ohms, depending on application.

Q4: How does temperature affect the calculation?
A: Resistance can change with temperature, especially for thermistors. This calculator assumes constant resistance.

Q5: What about power dissipation?
A: Power dissipated in the resistor can be calculated with \( P = I^2 \times R \) or \( P = \Delta V \times I \).