VWR 700-0115 Mode D'emploi page 15

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Current and power decrease throughout the run, providing an improving margin of safety
over time.
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The same voltage setting can be used regardless of the number or thickness of gels being
electrophoresed.
Current Limiting
Discontinuous buffer systems and, to a lesser extent, continuous systems increase resistance
during the run. If you use the current limiting setting on the 250V Power Supply, the voltage will
increase as resistance increases to satisfy Ohm's law (V=IR). If no voltage limit is set and a
local fault condition occurs, such as a poor connection, very high local resistance may cause
the voltage to increase to the maximum capacity of the power supply. This may lead to local
overheating and damage to the electrophoresis cell or create unsafe conditions. When
operating under constant current conditions, set a voltage limit on the power supply at or
slightly above the maximum expected voltage.
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