These are the kinds of values we need to be able to measure:

Quantity |
Symbol |
Unit |

Current |
I |
Ampere (A) |

Voltage |
V |
Volt (V) |

Resistance |
R |
Ohm (W) |

Frequency |
ƒ |
Hertz (Hz) |

Capacitance |
C |
Farad (F) |

Inductance |
L |
Henry (H) |

Power |
P |
Watt (W) |

These are the prefixes used to describe very large or very small values

Value |
Prefix |
Symbol |

1012 |
tera |
T |

109 |
giga |
G |

106 |
mega |
M |

103 |
kilo |
k |

10-3 |
milli |
m |

10-6 |
micro |
m |

10-9 |
nano |
n |

10-12 |
pico |
p |

10-15 |
femto |
f |