Electricity-induced Information and Courses from MediaLab, Inc.
These are the MediaLab courses that cover Electricity-induced and links to relevant pages within the course.
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| Which of the following can lower the amount of current needed to cause electricity-induced injury? | View Page |
| Which of the following identifies a major mechanism of electricity-induced injury? | View Page |
| What attribute of alternating current (AC) increases its potential for causing electricity-induced injury? | View Page |
| Electricity-induced Injury The major mechanisms of electricity-induced injury include: Electrical energy causing direct tissue damage Conversion of electrical energy into thermal energy causing massive tissue destruction Direct trauma resulting from falls or violent muscle spasms | View Page |
| Factors that Determine the Degree of Electricity-induced Injury The degree of electricity-induced injury is dependent on: The amount of electrical energy that is delivered The resistance that is encountered The type of current The current pathway The duration of contact Contact with alternating current (AC) is more likely to cause sustained muscular contraction than contact with direct current (DC). This sustained muscular contraction may prevent the victim from releasing the electrical source, increasing the duration of contact and the amount of electrical energy that is delivered. The resistance that is encountered is dependent on the body tissue that is traversed by the electrical current. Generally, tissues with high fluid electrolyte concentrations will conduct electricity the best. Bone is the most resistant tissue to electrical flow. Skin impedes electrical current, but resistance is dependent on the skin's thickness and moisture. Wet skin can reduce the contact resistance of the body.The degree of electricity-induced injury is also determined by which tissues are in the current pathway. Electrical current that passes through the head or thorax produces the most serious injuries including fatal arrhythmia, direct cardiac damage, respiratory arrest, direct brain injury, and paralysis. | View Page |