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.

2. How Does the Calculator Work?

The calculator uses Ohm's Law equation:

Where:

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

Explanation: The equation shows that current increases with higher voltage and decreases with higher resistance.

3. Importance of Current Calculation

Details: Calculating current is fundamental in electrical engineering and circuit design, helping determine appropriate component ratings and ensuring safe operation of electrical systems.

4. Using the Calculator

Tips: Enter voltage in volts and resistance in ohms. Both values must be positive numbers. The calculator will compute the current in amperes.

5. Frequently Asked Questions (FAQ)

Q1: What are typical current values in household circuits?
A: Typical household circuits in the US carry 15-20 amps at 120 volts.

Q2: Does Ohm's Law apply to all materials?
A: Ohm's Law applies to "ohmic" materials where resistance is constant. Some materials like semiconductors are non-ohmic.

Q3: What happens if resistance is zero?
A: In theory, current would approach infinity (short circuit). In practice, all circuits have some resistance.

Q4: Can I use this for AC circuits?
A: For AC circuits with only resistance (no inductance/capacitance), the same formula applies using RMS values.

Q5: How does temperature affect the calculation?
A: Resistance changes with temperature in most materials, which would affect current if voltage stays constant.