What safety feature is incorporated into an antistatic wrist strap?
1. >>A resistor in the path to ground
2. An alligator clip for quick disconnection
3. A high-voltage fuse
4. Static-eliminating material in the wrist band
5. A quick-release snap on the ground wire
Explanation : A wrist-grounding strap is necessary when working with PC motherboards, memory modules, and expansion boards. The strap drains away static electric charges that can damage microchips. A proper strap contains a high-value resistor (typically between 1 and 2 Megaohms) embedded in the strap or the coupling to the ground wire. One side of the resistor connects to a contact plate that touches your skin, and the other side connects to a wire lead (usually coiled) that should be connected to a known-good earth ground. The resistor is of high enough value that it acts as a short to ground for any high-voltage static charges that build up, but appears as an open circuit to the lower, current-carrying voltages that can be lethal (recall Current = Voltage / Resistance).
Static-eliminating material in the wristband may reduce static buildup.
A quick-release snap on the ground wire and an alligator clip for easy disconnection are conveniences, but not safety devices.
A high-voltage fuse would not offer protection against lower, current-carrying voltages.
Objective: Personal Computer Components
