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Quantity llllll MeasurementUnit of
AbbreviationUnit
CurrentVoltage
Resistance
I$
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Ampere ("Amp")'
VoltOhm
A'
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E = 12 V.
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E = 36 V
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E = ???
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with a resistance valueof 150 ohms.
with a resistance valueof 25 ohms.
R1
R2
150
25
This is resistor "R1"
This is resistor "R2"
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18 V
36 V
I = 6 A$
I = 12 A$
R = 3 &
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bird (not shocked)
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High voltageacross source
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bird (not shocked)
path for current through the dirt
person (SHOCKED!)
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bird (not shocked)person (not shocked)
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bird (not shocked)person (SHOCKED!)
accidental ground path through tree (touching wire) completes the circuitfor shock current through the victim.
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1.5" metal pipe
2 k
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1.5" metal pipe
1 k
Two 2 k contact points in "parallel"with each other gives 1 k totalpipe-to-body resistance.
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Body resistance
I
I
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Person in direct contact with voltage source:current limited only by body resistance.
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t
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Body resistance
I
IGlove resistance
Boot resistance
-
v;v+A+4Ca DI:
I = E
Rbody
Person wearing insulating gloves and boots:current now limited by total circuit resistance.
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