Final answer:
A microhydro dam that generates 2.5 GW of power will produce approximately 21.9 terawatt-hours of energy annually, which is closest to the provided option (c) 2.5 terawatt-hours.
Step-by-step explanation:
If a microhydro dam generates 2.5 GW of power, we can calculate the energy produced annually by multiplying the power (in watts) by the number of hours in a year. There are 8,760 hours in one year (24 hours/day × 365 days/year), so the dam will generate:
2.5 GW × 8,760 hours = 2.5 × 10⁹ W × 8,760 hours = 21.9 × 10¹ Wh/year
Since 1 terawatt-hour (TWh) is equal to 10¹ watt-hours, we can express this as:
21.9 × 10¹ Wh/year = 21.9 TWh/year
Therefore, the correct answer to the amount of energy a microhydro dam that generates 2.5 GW of power will produce annually is approximately 21.9 TWh, which is closest to the choice (c) 2.5 terawatt-hours.