1. What is Ohm's Law?

Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points, and inversely proportional to the resistance between them. For DC circuits, time does not affect the current calculation.

2. How Does the Calculator Work?

The calculator uses Ohm's Law equation:

Where:

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

Explanation: The equation shows that current is directly proportional to voltage and inversely proportional to resistance in a DC circuit.

3. Importance of Current Calculation

Details: Calculating current is fundamental for circuit design, component selection, and ensuring electrical safety in systems.

4. Using the Calculator

Tips: Enter voltage in volts, resistance in ohms. The time field is for reference only as it doesn't affect DC current calculations. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Does time affect DC current in a resistor?
A: No, for DC circuits, the current remains constant over time as long as voltage and resistance remain constant.

Q2: What are typical current values in circuits?
A: Current values vary widely from microamps in small electronics to amps in household circuits and kiloamps in industrial systems.

Q3: When does this equation not apply?
A: For AC circuits (use impedance instead of resistance) or for non-ohmic materials where resistance changes with voltage/current.

Q4: How does temperature affect the calculation?
A: Resistance changes with temperature for most materials, which would affect current if temperature varies significantly.

Q5: Can this be used for parallel/series circuits?
A: This calculates current for a single resistor. For complex circuits, equivalent resistance must be calculated first.