Most storage devices that do not require vision and a brain to read data fall into this category. Electromagnetic data may be stored in either an analog data or digital data format on a variety of media.
Direct Tripwire Alarm - The wire placed across the path is directly connected with the cord, wire or string placed across the particular path. Laser Tripwire Alarm - An invisible laser, typically an infra-red, is used instead of a cord or string.
Relevance. Rating Newest Oldest. Best Answer: - the earth wire is connected to the metal casing of an appliance. - if a live wire becomes loose and touches the casing a momentary large surge of current is drawn from the live wire and goes through the earth wire to the earth so that nobody gets hurt by an electric shock.- the large surge in current also blows the fuse.he Neutral wire provides the return for the circuit but the Earth wire is the secondary return should a fault develop to protect the user and normally connected to ground via metal parts of the appliance. For a more detailed explanation google and good luck with your test.