Why are there so few tidal energy installations in existence? ...

[Collmarie]

Why are there so few tidal energy installations in existence? Explain.
 
  What will be an ideal response?

Question 2

If a watt is a unit of power, how can a kilowatthour be a measure of energy? Explain.
 
  What will be an ideal response?

[fatboyy09]

Answer to Question 1

Generally, the civil engineering involved is very substantial. The cost must be
amortized and the money borrowed. Substantial civil engineering brings substantial costs.
Huge expenditures are harder to finance than smaller onesthe difficulty of obtaining the
financing is roughly proportional to the size of the money that needs to be raised to finance
the construction.

Answer to Question 2

The watt is a unit of power, equivalent to a joule per second. Therefore, a
wattsecond is the same as a joule. One watt times 60 seconds is a wattminute, and it is 60
joules. Sixty wattminutes is a watthour, and this is then equivalent to 3600 joules. A
thousand watthours is a kilowatthour, so that is the same as 1000 (3600 joules) = 3,600,000
joules.