Final answer:
The correct method to determine the voltage between terminals is Kirchhoff's Voltage Law, which states that the sum of all voltages around a closed loop is zero. This law allows for the calculation of an unknown voltage in a circuit, used alongside Ohm's Law and instruments like voltmeters.
Step-by-step explanation:
The method for determining the voltage between terminals can be effectively done using Kirchhoff's Voltage Law. Kirchhoff's Voltage Law (KVL) states that the sum of all electrical voltage differences around a closed loop must equal zero. This allows for the calculation of an unknown voltage in a circuit. Ohm's Law, which is defined by the equation V = I * R, relates the voltage across a resistor to the current through it and the resistor's resistance, and is used when the resistance and current are known. Alternatively, when analyzing a circuit to find unknown voltages, currents, and resistances, one would use Kirchhoff's rules and Ohm's Law in conjunction.
Voltmeters are tools used to measure the voltage between two points in a circuit, directly implementing these principles. KVL is used extensively when more complex circuits cannot be reduced to simple series and parallel arrangements, for which direct measurement may be difficult. Hence, for the student's question, option 1, Kirchhoff's Voltage Law, is the correct method to determine the voltage between terminals.