# Why is current always measured in series with resistor and voltage is measured in parallel?

In electronics lab, while doing superposition theorem, we were asked to measure the current flowing through resistor and voltage across the resistor. As instructed, we measured the current by connecting the multimeter probes in series with the resistor. And we measured the voltage by connecting the multimeter probes in parallel with the resistor.

Why are they measured in such a way?

• Commented Sep 12, 2017 at 23:04
• Because current is something that flows through the resistor, and voltage (potential difference) is something that's different between its two pins. Commented Sep 12, 2017 at 23:10
• @ThePhoton What is wrong in measuring the current flowing through the resistor by connecting multimeter probes to the two ends of the resistor?
– Home
Commented Sep 12, 2017 at 23:21
• Because that measures the current through the multimeter, not through the resistor
– Chu
Commented Sep 12, 2017 at 23:45
• @Home, a resistor only has two terminals, but some other devices have 3 or more, like a transistor. How would you apply your method of "measuring current based on connecting to two terminals of a device" to a transistor? Commented Sep 12, 2017 at 23:49