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 when voltage increases (if resistance stays the same) and decreases when resistance increases (if voltage stays the same).

3. Importance of Current Calculation

Details: Calculating current is essential for designing electrical circuits, selecting proper wire sizes, choosing circuit protection devices, and ensuring electrical safety.

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 if I know current and want to find voltage?
A: You can rearrange the formula: \( V = I \times R \). Multiply current by resistance to get voltage.

Q2: What if I know current and voltage but want resistance?
A: Rearrange the formula: \( R = \frac{V}{I} \). Divide voltage by current to get resistance.

Q3: Does Ohm's Law apply to all materials?
A: Ohm's Law applies to "ohmic" materials where resistance is constant. Some materials like diodes are non-ohmic.

Q4: What are typical household current values?
A: In North America, typical household circuits carry 15-20 amps at 120 volts. Large appliances may use 240 volts.

Q5: How does power relate to these values?
A: Power (in watts) can be calculated as \( P = V \times I \). Combining with Ohm's Law gives \( P = I^2 \times R \) and \( P = \frac{V^2}{R} \).