Question

Which amount of power is the smallest?

A- 1 gigawatt
B- 2 kilowatts
C- 3 megawatts
D- 4 watts

Answer 1

D is the correct answer. A watt is the smallest amount of power. The prefix kilo means a thousand, mega means a million and giga means a billion, so, in increasing size: watt - kilowatt - megawatt - gigawatt.

Answer 2

The correct answer is

D- 4 watts

In fact, the different prefixes correspond to the following:

kilowatt:
`1 kW = 10^3 W`

megawatt:
`1 MW=10^6 W`

gigawatt:
`1 GW=10^9 W`

Using the list above, we can convert all the options into Watts:

A)
`1 GW=1 \cdot 10^9 W`

B)
`2 kW=2 \cdot 10^3 W`

C)
`3 MW=3 \cdot 10^6 W`

D)
`4 W`

Therefore, the smallest quantity is D) 4 Watts.