Technical Standards and Safety Authority (TSSA) G3 Practice Exam

What would be the voltage reading between points B and C?

1. 0 ohms

2. 0 volts

3. Applied voltage

4. 0 watts

The correct answer is: 0 volts

The voltage reading between points B and C is correctly identified as 0 volts when there is no potential difference between these two points. This indicates that B and C are at the same electrical potential, meaning that there is no difference in voltage that would cause current to flow. In scenarios where points are connected directly or through a closed circuit without any load or resistance to create a voltage drop, the measurement will yield a reading of 0 volts. This is commonly observed in parallel circuits where multiple components share the same potential. When evaluating the other options, it is important to recognize that 0 ohms refers to a measurement of resistance, not voltage; applied voltage would suggest there is a potential difference present, which contradicts the 0 volts reading; and 0 watts relates to power, which is also not relevant for determining voltage. Thus, the context of electrical principles clearly supports that a reading of 0 volts is the correct response when the electrical potential between two points is equal.