Effectiveness(goal oriented): it's about doing the right tasks, completing activities and achieving goals.
Efficiency(effort, process, goal, time oriented): it's about doing in an optimal way (like doing it in a faster way or with least expenses)
Following could be the examples of single piece flow from our day to day life:
1. Automated Car wash
2. Self checkout in a big grocery shop (like walmart)
3. Order processing in a restaurant or coffee shop.