The circuit shown in Figure 2, which for the purposes of this article we'll call the Simple Source, accomplishes the same function with only one precision resistor ... some time as a current output ...

The classic approach for sensing an ac load's current requires a transformer or sensing resistor. The transformer may be expensive,... This circuit provides different ways to measure the current ...

Measuring resistance is a simple enough concept ... a sensibly sized constant current to the load, the voltage to be measured is too small for conventional multimeter. To overcome the problem ...

You can apply a short circuit and measure ... a digital multimeter to the multimeter terminals if you need a more accurate measurement. You can use a suitable rotary switch or a variable resistor and ...

Since the multimeter is measuring resistance as a calculation of an observed voltage drop due to an injected current, having the circuit powered on will cause interference with the resistance ...

Using the simple ... circuit implements current mode control and senses the LED current via resistor R14. The output voltage is boosted to just over 30V to drive 10 LEDs at a regulated current of ...

So the voltage across the series resistor will be \(4V\). In a series circuit, the current is the same at all points. So if the current in the LED is \(10 mA\), the current in resistor \(R\) is ...