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Why can a voltmeter potentially load a circuit?
Why can a voltmeter potentially load a circuit?
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A voltmeter can load a circuit due to its internal impedance, which can affect the overall resistance when measuring voltage. For instance, if a voltmeter has an internal impedance of 1 MOhm and is used on a high-resistance circuit, it can significantly alter the effective resistance. This change can lead to inaccurate voltage readings, especially when measuring across components like a 1 MOhm resistor. To minimize this loading effect, the voltmeter's internal impedance should be much larger than the resistance of the circuit being measured. Ensuring high internal impedance is crucial for accurate voltage measurements.
I grabbed an under cabinet LED light today at a big box store. Nothing special. 18 inches in length and made to plug several lights together. Here is a pic of the power cord:
The drawing on the box led me to believe that it would accept a standard IEC cord which surprised me. But it's a variation of it. I didn't try it, but I would assume you could plug a standard IEC cord into this and have a double male cord AKA suicide cord. And to boot, it's likely going to reverse the hot and...