stspringer
- May 10, 2019
- 116
- Joined
- May 10, 2019
- Messages
- 116
I have this circuit on a breadboard
9 volt battery
1 led
1 resistor
sorry no schematic
I am studying how to find a short a circuit
With NO short created I get the following:
With 9 volts power, to the breadboard, I put my DMM on the ohm setting and place the black probe on the negative power rail and the positive probe between the resistor and the led load and I get OL on the DMM pic 2 which I know I should get if there is no short in the circuit.
Question
When I place the red positive probe on the negative side of the led I get very high resistance reading 50 ohms pic 3 and climbing. Why is that?
With Short created I get the following:
Notice the black jumper wire going from positive side of led to ground to create a short. Meter now reads 35 ohms,which I know means anything other than OL means I have a short.see pic short_created_1.jpg
Now with short still active, meter red lead, after led "more negative side", meter reads 0 see pic short_created_2.jpg
Please advise
Thanks

9 volt battery
1 led
1 resistor
sorry no schematic
I am studying how to find a short a circuit
With NO short created I get the following:
With 9 volts power, to the breadboard, I put my DMM on the ohm setting and place the black probe on the negative power rail and the positive probe between the resistor and the led load and I get OL on the DMM pic 2 which I know I should get if there is no short in the circuit.
Question
When I place the red positive probe on the negative side of the led I get very high resistance reading 50 ohms pic 3 and climbing. Why is that?
With Short created I get the following:
Notice the black jumper wire going from positive side of led to ground to create a short. Meter now reads 35 ohms,which I know means anything other than OL means I have a short.see pic short_created_1.jpg
Now with short still active, meter red lead, after led "more negative side", meter reads 0 see pic short_created_2.jpg
Please advise
Thanks



