EPC2 - Effect of Current Flashcards
State TWO common examples of the beneficial effect of the chemical effect of electric current flow.
Batteries or cells
Electroplating,
Electrolytic refining.
State FOUR common examples of the beneficial effect of the magnetic effect of electric current flow.
Electromagnetic devices Measuring instruments, Motors & generators, Relays, Transformers, Contractors.
State TWO common examples of non-beneficial effects of the magnetic effect of electric current flow.
Magnetic stresses.
Magnetic interference,
Hysteresis loss,
Eddy current loss.
State the main application of the beneficial effect of the thermal effect of electric current flow.
Heating elements.
State TWO common examples of non-beneficial effects of the thermal effect of electric current flow.
Power losses in machines
Heating of cables.
What is meant by the term ‘electrolyte’?
An electrolyte is a conducting liquid.
What conditions can result in electrolytic ‘corrosion’ as referred to in AS/NZS 3000 Clause 5.5.5.3?
Dissimilar metals joined in the presence of an electrolyte (electrolytic corrosion), and effects of moisture.
What are TWO of the most dangerous effects of a high current passing through the human body?
Electrocution, Breathing can stop, The heart can stop, Ventricular fibrillation, Severe burns.
What is the lowest value of electric current which could be considered to be hazardous if passing through the human body (approximately)?
Approximately 20mA - 30mA.
List FOUR factors which affect the severity of an electric shock.
Voltage value Current value, Path of current through the body, Duration of contact, Body resistance, The individual, Point on cardiac cycle.
Which part of the human body is affected by the condition known as ‘ventricular fibrillation’?
The heart.
