Final answer:
Null measurement techniques such as using a potentiometer are accurate ways to check voltage, though they can be complex. It is false that the voltage is the same at every point in a given wire in a circuit diagram.
Step-by-step explanation:
The quickest method of checking voltage or a complete circuit, as the question asks, is not specified in the provided references. However, when it comes to measuring voltage accurately without affecting the circuit, null measurement techniques are used. A potentiometer is one type of device that uses null measurement techniques to determine voltage. It achieves greater accuracy by balancing a circuit so that no current flows through the measuring device, which reduces the impact on the circuit being measured. Nonetheless, while null measurements can be more accurate, they are also more complex compared to standard voltmeters and ammeters, and they have their limits in precision.
Regarding the true/false question about circuit diagrams, it is False that we can assume the voltage is the same at every point in a given wire. Voltage, the common word for potential difference, can vary along different points in a circuit due to resistance and other factors.