Electronics Engineering (ELEX) Board Practice Exam

What does a power supply with low output impedance typically indicate about its load regulation?

1. High load regulation

2. Low load regulation

3. No impact on load regulation

4. Unstable load regulation

The correct answer is: Low load regulation

A power supply designed with low output impedance generally indicates high load regulation. This is because low output impedance allows the power supply to maintain a consistent output voltage despite variations in the load current. When the load attached to the power supply changes, the low output impedance minimizes the voltage drop and helps keep the output voltage stable and close to the set value. In applications where the load may fluctuate or where precise voltage levels are required, high load regulation is essential. Power supplies with low output impedance can quickly respond to changes in load, ensuring that the output voltage remains steady, which is critical for sensitive electronic devices that require a stable supply voltage for optimal performance. High load regulation thus speaks to the ability of the power supply to keep the voltage constant across varying load conditions, reinforcing the notion that a low output impedance is beneficial in achieving this regulation.