Posted by Indiana Ken on May 17, 2011 at 07:25:09 from (66.249.229.38):
In Reply to: external resistor posted by Henryv111111 on May 17, 2011 at 06:47:05:
The voltage drop across a resistor is a function of current (amperes) and is given by: Voltage Drop = I x R where I is in amperes and R is the resistance value of the resistor in ohms. For example, if the resistance value is 2 ohms and the current is 3 amperes the voltage drop acros the resistor will be 6 volts (2 x 3 = 6). In this case for a 12 V battery, the battery side of the resistor to ground will measure 12 volts and the load side of the resistor to ground will measure 6 volts.
This is the down side of using resistors to change voltage levels - it only works when the current is constant and does not change.
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