Limiting Maximum Current of the Power Supply. Which Meter has almost zero resistance? Current meter R i  0  e.g.,  R i 

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Presentation transcript:

Limiting Maximum Current of the Power Supply

Which Meter has almost zero resistance? Current meter R i  0  e.g.,  R i 

What might happen if you connect the Current Meter across (in parallel) a Power Supply by mistake? A high current will flow through the circuit. As a result: the Current meter will burn out, or, the Power Supply will burn out, or, the connecting wire will burn out. Because, a very high amount of current will flow through the meter, as there is no resistance ( ( 0  ) in the circuit. According to Ohm’s Law: I = V/R = 5 V/0  =  (infinite Ampere) Power Supply V S = 5 V R  0  ?

Current limiting circuitry To Protect your Current meter and the Power Supply itself, the Power Supply is equipped with current limiting circuitry.

Set Maximum Current of the Power Supply to 100 mA For most of your experiments 100 mA is enough current. At the same time it is within the safe limit of the current meter (which has a fast blow fuse of 500mA).

Procedure for setting Maximum Current of the Power Supply to 100 mA 1.Adjust the Power Supply voltage to 5 V (or the voltage desired). 2.Turn the current limiting knob (right-hand side knob) counter clockwise to 0 mA. 3.Connect a wire between the Positive (+) terminal and the Negative (-) terminal (to make a short circuit). 4.Turn the current limiting knob (right-hand side knob) clockwise to set the current to 100 mA (5 small divisions or, 1 large division). 5.Remove the wire (used to short circuit) between the Positive terminal and the Negative terminal of the power supply for it’s normal operation. Note: Do not short circuit the power supply for a long time or unnecessarily.