Constants

Unit

Multiple	Prefix	Symbol
1012	tera	T
109	giga	G
106	mega	M
103	kilo	k
10-3	milli	m
10-6	micor	u
10-9	nano	n
10-12	pico	p
10-15	femto	f

kilo- 的縮寫

在 electronics 常用小寫 k, e.g. kV;
在 computer science 常用大寫 K, e.g. KB

Electricity

• Voltage
  • electromotive force (EMF)
  • usually expressed in: kV, V (volts), mV, uV
• Current
  • usually expressed in: A (amperes), mA, uA, nA, pA
• Resistance and resistors
  • frequently used type come in values from 1 ohm to about 22 megohms
• Capacitors
  • expressed in: F (farad; very large), uF (usually), pF (ususlly)
• Inductors
  • measured in: H (henrys), mH, uH