Uzasadnienie: 

Naszym zadaniem jest wyrażenie podanych mocy ze wskazanych jednostkach. Wiemy, że megawat to milion watów oraz kilowat to tysiąc watów:

$1\text{MW}=1000000\text{W}$

$1\text{kW}=1000\text{W}$

Z tego wynika, że:

$1\text{W}=\frac{1}{1000000}\text{MW}$

$1\text{W}=\frac{1}{1000}\text{kW}$

Rozważmy poszczególne przypadki podane w zadaniu:

▶ $200\text{kW}=200\cdot 1000\text{W}=$

$=200000\text{W}$

 ▶ $10\text{MW}=10\cdot 1000000\text{W}=$

$=10000000\text{W}$

▶ $0,5\text{MW}=0,5\cdot 1000000\text{W}=$

$=500000\text{W}$

▶ $3\text{MW}=3\cdot 1000000\text{W}=$

$=3000000\text{W}=3000\cancel{000}\cdot \frac{1}{1\cancel{000}}\text{kW}=$

$=3000\text{kW}$

▶ $980\text{W}=980\cdot \frac{1}{1000}\text{kW}=$

$=\frac{980}{1000}\text{kW}=\frac{98}{100}\text{kW}=0,98\text{kW}$

▶ $100000\text{W}=1\cancel{00000}\cdot \frac{1}{10\cancel{00000}}\text{MW}=$

$=\frac{1}{10}\text{MW}=0,1\text{MW}$

▶ $5200000\text{W}=52\cancel{00000}\cdot \frac{1}{10\cancel{00000}}\text{MW}=$

$=\frac{52}{10}\text{MW}=5,2\text{MW}$

▶ $300\text{kW}=300\cdot 1000\text{W}=$

$=300000\text{W}=3\cancel{00000}\cdot \frac{1}{10\cancel{00000}}\text{MW}=$

$=\frac{3}{10}\text{MW}=0,3\text{MW}$

 

 Odpowiedź: 

$200\text{kW}=\underset{\text{............................}}{200000}\text{W}$ $10\text{MW}=\underset{\text{............................}}{10000000}\text{W}$ $0,5\text{MW}=\underset{\text{............................}}{500000}\text{W}$ $3\text{MW}=\underset{\text{............................}}{3000}\text{kW}$ $980\text{W}=\underset{\text{............................}}{0,98}\text{kW}$

$100000\text{W}=\underset{\text{............................}}{0,1}\text{MW}$ $5200000\text{W}=\underset{\text{............................}}{5,2}\text{MW}$ $300\text{kW}=\underset{\text{............................}}{0,3}\text{MW}$