001 Resistive component multimeter voltage-current-resistance measurements

The simplest circuit is pretty much a single resistive component being powered directly by a regulated power source or battery. Since 5 volt regulated, and adjustable voltage/maximum current supplies are very common, I will therefor be primarily focused on using a supply set to 5V throughout my material.

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Diagram

Basic electronics circuit fragments and simple circuits 1 diagram covering resistors ohms law and multimeter measurements by electronzap electronzapdotcom
Basic electronics circuit fragments and simple circuits 1 diagram covering resistors ohms law and multimeter measurements by electronzap electronzapdotcom

Video

Electronics course 1 Resistor component limiting current Ohms law and multimeter measurements

Topics:

  • Simple circuit and multimeter measurement basics tutorial video
  • Main topics explained in video and diagram
  • Related Products that I use or am interested in using
Resistor axial through hole component close up image by Electronzapdotcom and electronzap
Resistor axial through hole component close up image by Electronzapdotcom and electronzap
Simple circuit and multimeter measurement basics tutorial video Topics:
  • Using a power supply basics.
  • Multimeter usage to measure voltage, current, and resistance of parts of a circuit.
  • Ohms law used to calculate current through a resistor based on it’s resistance and the voltage across it.
  • Resistance’s linear relationship between voltage and current.
  • Tips on keeping a resistive component from overheating based on it’s wattage rating and the power through it. Calculated using a power variation of Ohms law which is sometimes called Watt’s law.

Using the link above the video to watch it in a new tab is more helpful in letting YouTube and myself know that there is interest in this kind of video than watching the embedded video directly.

Main topics explained in video and diagram

The way that resistors respond to voltage, is to let a certain amount of current flow through them based on the voltage across them, and the amount of resistance that they have (Ohms law formula for current – I=V/R). You may also enjoy my page Electronic formulas simplified – Calculations cheat sheet

If no other components are in series with the resistor then it will have the full power supply voltage across it. Series components split up the power supply voltage.

Forward biased diodes block a certain amount of voltage from series components, but keep in mind that the voltage blocked does vary a small amount based on current. Resistive components in series divide up the voltage based on their percentage of the resistance (after having subtracted the voltage blocked by any semiconductors, such as diodes).

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