Farad

Measures capacitance, the ability of a body to store an electrical charge. 1 Farad = the ability to store 1 couloumb

Term	Symbol	Weight
Picofarad	pF	`10^{-12}`
Nanofarad	nF	`10^{-9}`
Microfarad	$\micro$F	`10^{-6}`
Milifarad	mF	`10^{-3}`
Farad	F	`10^0`
Kilofarad	kF	`10^{3}`

Couloumb

1 coulomb is the electric charge transported within one second through the cross-section of a conductor in which an electric current of the strength of 1 ampere flows.

Henry

Measures electrical Inductance

\displaystyle V(t)=L{\frac {dI}{dt}}

Volts

Measures electric potential

Amperes

Measures electric current

Ohms

Measures resistance

Term	Symbol	Weight
Nanoohm	n$\ohm$	10-9
Microohm	`\micro \ohm`	`10^{-6}`
Milliohm	m$\ohm$	`10^{-3}`
Ohm	`\ohm`	`10^{0}`
Kiloohm	k$\ohm$	`10^{3}`
Megaohm	M$\ohm$	`10^{6}`
Gigaohm	G$\ohm$	`10^{9}`

Hertz

Measures frequency

Term	Symbol	Weight
Hertz	Hz	`10^0`
Kilohertz	kHz	`10^{3}`
Megahertz	mHz	`10^6`

Watt

Measures Power

Power = V * I = \frac{V^{2}}{R} = I^{2}R

Joules per Second

Term	Symbol	Weight
Nanowatt	nW	`10^{-9}`
Microwatt	$\micro$W	`10^{-6}`
Milliwatt	mW	`10^{-3}`
Watt	W	`10^{0}`
Kilowatt	kW	`10^{3}`
Megawatt	MW	`10^{6}`
Gigawatt	GW	`10^{9}`

Examples:

Device	Power
Arduino	167mW
Laptop	1.5W
House	2.2kW

Decibel

A decibel (dB) is used to describe the ratio between two values, it is calculated as \displaystyle 10\log{10}{\frac{V1}{V2}}

Here are a few commonly used values

db Value	Power Ratio (10logA)	Voltage/CurrentRatio (20log(A))
-20dB	0.01	0.1
-10dB	0.1	0.3162
-6dB	0.25	1/2 = 0.5
-3dB	1/2 = 0.5	`1\sqrt{2} \approx 0.707`
-1dB	0.79	0.89
0dB	1	1
1dB	1.26	1.1
3dB	2	`\sqrt{2} \approx 1.414`
6dB	4	2
10dB	10	`\sqrt{10} \approx 3.162`
20dB	100	10
30dB	1000	31.62

Decade

Related to Frequencies

One decade is a distance along the frequency line, for example 1 \rightarrow 10 or 10 \rightarrow 100

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