Laboratory work № 3
Investigation of electric current influence on human organism
Institute, group number:
Name:
CONTENT of LABORATORY WORK
1) Value of perceptible current is measured by portable equipment. Before the beginning it is necessary to execute following operations: a regulator "Outgoing voltage" ("Вихідна напруга") to set into extreme left position; a switch "Current type" to set into middle position; to press a К1 drawing-pin, to prepare to work a block relay.
CARRING OF RESEARCH
1 To install a handle "Current type" into position "Direct current".
2 To touch by two fingers of left hand to electrodes "Going out" ("Вихід"), and by middle finger of hand to press button К2.
3. By right hand to turn slowly a handle "Outgoing voltage" ("Вихідна напруга"), increasing voltage in chain, and to keep an eye on voltmeter data and ammeter.
4. At point of feeling of electric current to check off the current strength and voltage. To set by handle "Current type" variable current with frequency 50 Hz and to take an experiment in sequence stated above. Then an experiment to cut back for constant and variable currents and for humid skin, moistening the fingers of left hand by water. Results of measuring to drop in into tab. 1.
THE INFLUENCE OF ELECTRIC CURRENT ON HUMAN ORGANISM
Table 1.
Skin state |
Alternative current |
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Electric current J, mA |
Voltage U,V |
Resistance R, Ohm |
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dry |
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wet |
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