ESD wrist strap safety principle: An anti-static wrist strap includes a small component so that you do not become the lowest-impedance path to ground. What is that component?

Introduction / Context:
Electrostatic discharge (ESD) control requires safely equalizing potential between a person and equipment. Wrist straps connect the wearer to ground through a controlled impedance path to bleed charge without creating a shock hazard.

Given Data / Assumptions:

• Standard ESD wrist straps are used with a grounded mat or dedicated ESD ground.
• We want to avoid a dangerous high-current path while still draining static charges.
• The strap contains an inline component for current limiting.

Concept / Approach:

The inline component is a high-value resistor (typically about 1 megaohm). It limits current to safe levels if the wearer touches a live conductor accidentally, while still allowing slow discharge of static electricity to prevent sudden ESD events. Capacitors or diodes are not used for this primary safety function in straps; the resistor provides both protection and controlled bleed.

Step-by-Step Solution:

Verification / Alternative check:

Many straps have a visible barrel with the resistor; continuity testers for ESD kits verify the resistor value. ESD standards recommend such current-limiting elements to meet safety practices.

Why Other Options Are Wrong:

• Capacitor: would pass AC transients and is unsuitable as a sole safety element.
• Diode/transistor: active or directional components are unnecessary and do not provide the required current limiting in both directions.
• None of the above: incorrect because a resistor is standard.

Common Pitfalls:

Clipping the strap to painted or insulated surfaces; bypassing the resistor by DIY cords; failing to test the strap periodically. Always connect to a verified ESD ground point.

Final Answer:

resistor