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Definition
E=IR
Voltage= Amperage x Resistance |
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Definition
Amperage x Resistance
E=IR |
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Term
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Definition
Measured in watts
Voltage x Amperage
E x I |
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Term
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Definition
Watts x seconds
Measured in Joules |
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Term
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Definition
Electron flow is always in the same direction |
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Definition
Electron flow reverses at regular intervals |
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Term
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Definition
resistive force in an AC circuit |
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Term
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Definition
Frequency x inductance
or
1
frequency x capacitance
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Term
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Definition
The greater the frequency the less the impedance |
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Term
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Definition
An opposing force can be induced in a separate wire or iron core |
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Term
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Definition
15-20 A
Do no protect against lethal shock |
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Term
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Definition
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Term
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Definition
Disruption of normal cellular electrical activity
Thermal Injury |
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Term
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Definition
Large amount of current flow
in excess of 5 mA |
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Term
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Definition
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Definition
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Term
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Definition
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Term
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Definition
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Term
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Definition
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Term
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Definition
current applied per unit area |
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Term
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Definition
Ungrounded
Accomplished with isolation transformer
Equipment casings will be grounded and allow discharge of leakage current |
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Term
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Definition
Monitor the integrity of power system
Measures circuit impedence to ground
Indicated in mA total possible current flow to ground |
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Term
Line Isolation Monitor Alarms |
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Definition
2-5 mA
Alarms when faulty piece of equipment allows more than 5 mA
Alarms sum of many small leakages from various equipment reach 5 mA
Cannot detect a faulty gorund wire |
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Term
Ground Fault Circuit Interpreter
(GFCI) |
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Definition
Monitors the current in hot and neutral wires
If reaches > 5mA then the circuit is interupted |
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Term
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Definition
Catheter or wire in the heart can deliver very high current density
100 microamps can induce V-Fib |
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Term
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Definition
Isolate power supply from patients
Use very high impedence (small wires)
Deliver < 10 microamps
Ex. pacemakers |
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Term
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Definition
High Frequencies: 500,000 - 1,000,000 Hz
Heat produced is inversley proportional to the area delivered
High Frequency (0.2-2 MHz) do not induce V-Fib
Must use large return pad |
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Term
Bipolar Electrosurgical Devices |
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Definition
Preferable and cause less induction
(all can cause problems with pacemakers and AICDs) |
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Term
Unipolar Electrosurgical Devices |
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Definition
Used with lowest possible settings
Used in brief periods as possible
DO NOT use within 15 cm of pacemaker or AICD |
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