* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Electrical Safety Example
Survey
Document related concepts
History of electromagnetic theory wikipedia , lookup
Resistive opto-isolator wikipedia , lookup
Buck converter wikipedia , lookup
Ground (electricity) wikipedia , lookup
Switched-mode power supply wikipedia , lookup
Opto-isolator wikipedia , lookup
Electrical substation wikipedia , lookup
Fault tolerance wikipedia , lookup
Current source wikipedia , lookup
Stray voltage wikipedia , lookup
Circuit breaker wikipedia , lookup
Mains electricity wikipedia , lookup
Rectiverter wikipedia , lookup
Alternating current wikipedia , lookup
Transcript
Electrical Safety Example • A person accidentally grabs conductors connected to each end of a DC voltage source in each hand. – What is the minimum source voltage that can produce electrical shock sufficient to cause paralysis, preventing the person from letting go of the conductors? – Assume that the resistance of the arm is 400Ω, the trunk is 50Ω, and the leg is 200Ω. ECE 201 Circuit Theory 1 1 + V - ECE 201 Circuit Theory 1 2 + V - Current flows through the arms RA = 400 Ω ECE 201 Circuit Theory 1 3 Safety Example continued • From Table 2.1, the minimum current for muscle paralysis is 50 mA. V iRarms (50mA)(400 400) V 40V ECE 201 Circuit Theory 1 4 Safety Example continued • Is there a significant risk of this type of accident occurring while servicing a personal computer, which typically has 5V and 12V sources? ECE 201 Circuit Theory 1 5 Safety Example continued • Compute the maximum current that can be drawn from the computer power supply. imax 12V 15mA 800 • This current will cause a shock, but will not cause muscle paralysis. ECE 201 Circuit Theory 1 6