#2 UNBasics: How to measure current without an ammeter.

If you don't have an ammeter or a multimeter with amp measurement, you can use a regular voltmeter or an oscilloscope to measure the voltage across a known value resistor. Measure the voltage, divide the voltage by the resistance to get the current. Ohm's law: V=I*R (or I = V/R). Note about the resistor: while the colour-coding is easy to read, it's not accurate. The resistor's nominal value is 620Ω, but it has a 5% tolerance, so its actual value can be as high as ~650Ω or as low as ~590Ω. For accurate calculations, it's important to know the exact value. The SHUNT video to which I made a reference: https://www.youtube.com/watch?v=j4u8fl31sgQ ------------------------------ Music by LiQWYD: https://www.youtube.com/watch?v=flpBtykbMJc&list=RDnSDovG5vQQA&index=12 ------------------------------