Electrical Safety in the Laboratory. Joshua D. Horvath Andrew J. Gellman Carnegie Mellon University Department of Chemical Engineering February 18, 2003. Accidents. Electrical shock from laser power supply Electrical shock from electrophoresis power supply. Introduction.
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Relationship between power,
current, voltage and resistance:
P = power (watts)
I = current (amperes)
V = voltage (volts)
R = resistance (ohms)
Heating tape uses 5 amps at 120 volts.
Power dissipated by this device is 600 watts.
Direct current (DC)
Alternating current (AC)
+ 5V -
High Voltage Probe
+ 5V -
Power requirements (input)
Chart below assumes 1 second hand to foot
exposure to 120 volt, 60 cycle AC power supply.
Laboratory wall outlets provide 20,000 mA !!
Circuit Breakers (in action)