Technical Standards and Safety Authority (TSSA) G3 Practice Exam

What would be the voltage reading between D and E if voltage was applied in D?

1. 0 ohms

2. 0 volts

3. applied voltage

4. 0 watts

The correct answer is: applied voltage

When voltage is applied at point D, the voltage reading between D and E would be equal to the applied voltage. This is because the voltage reading essentially measures the difference in electric potential between two points. If point D is energized with a specific voltage, that voltage is present at point D relative to point E, which would be at a lower or no voltage unless otherwise connected or referenced. The focus is on the definition of voltage, which is the potential difference between two points in an electrical circuit. Thus, if voltage is applied at point D and point E is at a reference potential or ground, then the measurement between the two points will reflect the full value of the applied voltage from D. The other options do not correctly describe the situation. Reading 0 ohms pertains to resistance, which is unrelated to the voltage measurement. A reading of 0 volts would indicate both points are at the same potential, which is not the case here with an applied voltage at D. Volts times amperes yield watts, so “0 watts” does not apply in this case as a measurement of voltage, but rather power, which is also not relevant to the question of voltage reading directly between D and E.