The 5W 1 Ohm Ceramic Cement Resistor is a heavy-duty passive component designed to handle high power and heat without failure. At Electrapac, we recommend this resistor for power supply filtering, motor speed control, and current sensing applications where standard carbon film resistors would simply burn out.

Product Overview

Encased in a flame-retardant ceramic "cement" shell, this resistor is built for durability. The internal resistive wire is wound around a fiberglass core and sealed with a special non-flammable cement filler. This design provides excellent heat dissipation, high moisture resistance, and a fully insulated body that can be mounted directly against other components or metal chassis without short-circuiting. 

Key Features for Electrapac Customers

• Superior Heat Resistance: The ceramic housing is completely fireproof, ensuring that even under a full 5-watt load, the resistor remains stable and safe.

• Low Resistance Value ($1\Omega$): Perfect for use as a "shunt" or current-sensing resistor to measure the current flowing through a high-power circuit.

• Vibration Proof: Unlike fragile carbon resistors, the solid cement filling holds the internal wire-wound core firmly in place, making it ideal for automotive or industrial machinery.

• Excellent Insulation: The outer shell provides high dielectric strength, meaning you don't need to worry about the body of the resistor conducting electricity to nearby parts.

• Large Surface Area: The rectangular shape is designed to radiate heat into the air efficiently, preventing "thermal runaway" in your power circuits.

Wiring & Usage Guide

Because this is a Wire-wound resistor, it is generally "non-polarized" (can be connected in either direction). However, keep these tips in mind for your Electrapac projects:

1. Airflow: Since 5W resistors generate significant heat, try to leave a small gap between the resistor and the PCB surface to allow for air circulation.

2. Current Limiting: With a 1Ω value, this resistor is often used to limit current in high-power LED arrays or to protect a circuit from sudden surges.

3. Current Sensing: By measuring the voltage drop (V) across this resistor, you can easily calculate the current (I) in the circuit using Ohm’s Law:

   $$I=V/R$$

   1. (Since $R=1$, the voltage you measure is equal to the current in Amps!)

   Primary Applications

   • Current Sensing: Monitoring the current draw of large DC motors or battery chargers.

   • Power Supply Filtering: Used in the output stages of audio amplifiers or DC power bricks to reduce electrical noise.

   • Speaker Crossover Networks: Balancing the power between woofers and tweeters in high-end audio systems.

   • Inrush Current Limiting: Protecting power supplies from the sudden "spike" of energy when first turned on.

   • Dummy Loads: Testing small power supplies or batteries by simulating a 1Ω load.

   Why Shop at Electrapac?

   We source our Ceramic Cement Resistors with high-purity wire cores to ensure they maintain their rated 1Ω value even at high operating temperatures. Visit us at www.electrapac.com for the rugged components that keep your high-power electronics safe and steady.