Question

1. what nineteenth - century invention led to the expanded use of hydroelectric power?

○ magnetic fields
○ waterwheels
○ high dams
○ turbines

Explanation:

Waterwheels predate the 19th century, magnetic fields are a natural phenomenon not an invention, and high dams were not the key 19th-century innovation for expanded hydroelectric use. Turbines, specifically improved hydraulic turbines developed in the 19th century, enabled efficient conversion of water flow into mechanical and then electrical energy, driving the expanded use of hydroelectric power.

Answer:

○ turbines