Technical Standards and Safety Authority (TSSA) G3 Practice Exam

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

1. 0 ohms

2. 0 volts

3. applied voltage

4. 0 watts

The correct answer is: 0 volts

The reasoning behind selecting the answer that indicates the voltage reading between points C and D as "0 volts" is rooted in the concept of electrical circuits and how voltage is measured in relation to a reference point. When voltage is applied at point A, it can create a potential difference across various components connected to it. If there is no intervening component or path between C and D that would allow current to flow, or if C and D are at the same electrical potential due to the circuit configuration, then no voltage would be observed between them. This situation would result in a reading of "0 volts," implying that C and D are electrically equidistant from the reference point where the voltage is applied. In contrast, the other choices do not accurately represent the outcome in this scenario. "0 ohms" pertains to resistance, which does not apply to voltage measurements directly. "Applied voltage" would imply that there is a voltage present between C and D, which contradicts the reading being zero volts. Lastly, "0 watts" deals with power, which is the product of voltage and current; in the case of zero voltage, power would also be zero, but this is not explicitly the question asked regarding voltage between the two points. Thus,