If at least 3,000 volts of static electricity must build up before a person can feel electrostatic discharge (ESD) why should an antistatic wrist strap be worn at all times when working on a computer?

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If at least 3,000 volts of static electricity must build up before a person can feel electrostatic discharge (ESD) why should an antistatic wrist strap be worn at all times when working on a computer?

Electronic components can be damaged by voltages as low as 30 volts.
Antistatic wrist straps are more effective at low voltages.
An antistatic wrist strap must be calibrated for particular ESD circumstances.
ESD may suddenly spike to 3,000 volts without warning.

Explanation: Voltage as low as 30 volts can damage electronic components, so wear an antistatic wrist strap when working on a computer.

Exam with this question: 1.8.3 Quiz - Personal Computers