100 Ohm Resistance Calculator

Fixed 100 Ohm Calculation:

\[ R = 100 \ \Omega \]

Power (V²/R):

Power (I²R):

Power (VI):

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1. What is a 100 Ohm Resistor?

A 100 ohm resistor is a common fixed-value resistor used in electronic circuits. It follows Ohm's Law (V = IR) where the voltage across it is proportional to the current through it.

2. How Does This Calculator Work?

The calculator uses the following formulas:

\[ P = \frac{V^2}{R} \] \[ P = I^2 \times R \] \[ P = V \times I \]

Where:

\( P \) — Power in watts (W)
\( V \) — Voltage across resistor (V)
\( I \) — Current through resistor (A)
\( R \) — Fixed resistance (100 Ω)

Explanation: All three formulas calculate power dissipation in the resistor, providing cross-verification of results.

3. Importance of Fixed Resistance Calculations

Details: Calculating power dissipation is crucial for selecting resistors with appropriate wattage ratings and preventing overheating in circuits.

4. Using the Calculator

Tips: Enter either voltage or current (or both) to calculate power dissipation. Values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why use a 100 ohm resistor?
A: 100 ohms is a standard value used for current limiting, voltage division, and pull-up/pull-down applications in circuits.

Q2: What's the maximum power for a typical 100 ohm resistor?
A: Common through-hole resistors are 1/4W or 1/2W. Surface-mount resistors may be as low as 1/16W.

Q3: How accurate are 100 ohm resistors?
A: Standard resistors have ±5% or ±1% tolerance. Precision resistors can be ±0.1% or better.

Q4: What happens if I exceed the power rating?
A: The resistor may overheat, change value, or fail catastrophically.

Q5: Can I use this for AC calculations?
A: Yes, for RMS voltage and current values at frequencies where parasitic effects are negligible.