# WebWork Guide

## WebWork Guide

### Units

Every number deserves a unit. Every time you write or enter a number you should think about the unit of the number. There are some cases (radians, cycles, etc.) where we consider the numbers unitless but you should still think about those cases.

WebWork will require you to enter units for most answers. The units I use in this class are summarized here.

Unit   Symbol   WebWork
Abbreviation
degrees ° deg
Amperes A A
Volts V V
Ohms Ω ohm
Hertz Hz Hz
seconds s s
minutes min min
Coulombs C C
Joules J J
Watts W W

### Exponential Notation

Unfortunately WebWork does not accept all SI prefixes. Therefore, all numbers should be entered using exponential notation. A table below has a number of examples.

Value       WebWork
Entry
45° `45 deg`
1.25mA `1.25E-3A`
5kJ `5E3 J`
1.1pF `1.1E-12F`

### Functions

Description WebWork
Symbol
Add `+`
Subtract `-`
Multiply `*`
Divide `/`
Natural Exponential `exp()`
Sine `sin()`
Cosine `cos()`

### Time-domain

Value   WebWork Entry
6cos(1500t-45°)   `6*cos(1500*t-(pi/4))`
12cos(700t+50°)   `12*cos(700*t+50*(pi/180))`