# 001 Resistive component multimeter voltage-current-resistance measurements

Table of Contents

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.

Kit that has everything you need to learn basic electronics and Arduino.

## Diagram

Similar resistor kit to the one I have. Lots of values at a low price.

### Video

#### 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
##### 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.

The ad above is to a best selling multimeter since the ones I use are unfortunately not being sold anymore. It still helps this site if you click the link, check out the meter and compare it with other meters to see what looks best for you!

##### 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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