1. What is Current Through a Resistor Calculator?

Definition: This calculator determines the electric current flowing through a resistor using Ohm's Law.

Purpose: It helps engineers, students, and hobbyists calculate current in electrical circuits.

2. How Does the Calculator Work?

The calculator uses Ohm's Law formula:

Where:

• \( I \) — Current (amperes)
• \( V \) — Voltage (volts)
• \( R \) — Resistance (ohms)

Explanation: The voltage across the resistor is divided by its resistance to calculate the current flowing through it.

3. Importance of Current Calculation

Details: Proper current calculation ensures circuit components operate within their rated specifications and prevents damage from excessive current.

4. Using the Calculator

Tips: Enter the voltage across the resistor and its resistance. Resistance must be greater than 0.

5. Frequently Asked Questions (FAQ)

Q1: What if I get 0 current?
A: Either voltage is 0 (no potential difference) or resistance is infinite (open circuit).

Q2: Can I use this for AC circuits?
A: This calculates instantaneous current. For AC, use RMS values for voltage.

Q3: What units should I use?
A: Voltage in volts, resistance in ohms - result will be in amperes.

Q4: Why does resistance need to be > 0?
A: Division by zero is undefined. Zero resistance would theoretically cause infinite current.

Q5: How accurate is this calculation?
A: It's theoretically perfect for ideal resistors. Real-world factors like temperature may affect actual current.