Electrical quantities such as resistance, voltage, power, inductance and capacitance can have very large values. For example a power station can generate 1,000,000,000 watts of power, similarly an inductor can have a value of 0.00001 H. To keep things straight forward, a common practice is to use prefixes. Each prefix represents a power of ten. The table below display top 7 prefixes that are very common in Electrical and Electronics Engineering.

Number | Power of 10 | Prefix | Symbol |

1 000 000 000 | 10^{9} | giga | G |

1 000 000 | 10^{6} | mega | M |

1 000 | 10^{3} | kilo | k |

0.001 | 10^{-3} | milli | m |

0.000 001 | 10^{-6} | micro | μ |

0.000 000 001 | 10^{-9} | nano | n |

0.000 000 000 001 | 10^{-12} | pico | p |

**Examples**

Example 1: Express 33000 V in kilovolts.

Solution: Multiply and divide the number by 1000

= 33000 V * (1000/1000)

= (33000/1000) V * 1000

= 33 kV

Example 2: Express 0.222 A in milliAmps.

Solution: Multiply and divide the number by 0.001.

= 0.222 * (0.001/0.001) A

= 0.222 * (m/0.001) A

= (0.222/0.001) mA

= 222 mA