Microsoft Corporation - A+ Certification Training Kit

The following points summarize the key concepts in this chapter:

Power

• Ohm's Law states that the current flowing through a conductor, or resistance, is linearly proportional to the applied potential difference (volts).
• Electricity is delivered to our homes and businesses as AC (alternating current). Computers use DC (direct current).
• Electricity always seeks the path of least resistance to ground. An electrical outlet or an extension cord without a ground wire is unacceptable for use with a computer.
• A multimeter is an instrument used to measure electrical voltage, current, resistance, and continuity.

Electrostatic Discharge (ESD)

• Electrostatic discharge (ESD) depends on the types of materials and the amount of friction involved, the humidity, and how quickly the energy is released. ESD can cause damage to computer parts. Always take preventive measures when working around a computer.

Safety and Electrical Power

• It is vital to follow basic electrical-safety guidelines when working around electrical and electronic devices. Remember—electrical safety is your responsibility.