Power and intensity units
Units that support prefixes are shown in bold.
| Unit Name, System | Units Students Enter | Infix You Code | Notes |
|
apparent power
|
VA m^(2)*kg*s^(-3) |
VA m^(2)*kg*s^(-3) |
Code apparent power as VA. Avoid using base units. |
|
candela SI |
cd | cd | |
|
decibel SI |
dB | dB | For intro courses, decibels are more common than bels, so bels are not currently supported. |
|
energy per time SI |
J*min^(-1) J*h^(-1) |
J*min^(-1) J*h^(-1) |
|
|
horsepower US |
hp Hp HP |
hp | Use only hp when coding. |
|
intensity SI |
W*m^(-2) kg*s^(-3) |
W*m^(-2) kg*s^(-3) |
Code intensity as W/m^2 unless you specifically need the expression in base units. |
|
lumen SI |
lum lx*m^(-2) m^(-2)*cd |
lum lx*m^(-2) m^(-2)*cd |
Code illuminance as lum unless you specifically need lx/m^2. Avoid using base units. |
|
luminosity SI |
W J*s^(-1) |
W J*s^(-1) |
Code luminosity as W unless you specifically need J/s. Avoid using base units. |
|
lux SI |
lx cd*sr cd |
lx cd*sr |
Code luminous flux as lx. Avoid using other units. lx is not the same as cd, but is a valid student entry to avoid confusion. |
|
Poynting vector SI |
J*(m^2*s)^(-1) W/m^2 kg*s^(-3) |
J*(m^2*s)^(-1) W/m^2 kg*s^(-3) |
Code the Poynting vector as W/m^2 or J/(2*m^2). Avoid using base units. |
|
reactive power
|
VAR
m^(2)*kg*s^(-3) |
VAR
m^(2)*kg*s^(-3) |
Code reactive power as VAR. Avoid using base units. |
|
solar luminosity SI |
L_Sun L_sun W J*s^(-1) m^(2)*kg*s^(-3) |
L_Sun W J*s^(-1) m^(2)*kg*s^(-3) |
L_Sun and L_sun are valid student entries for solar luminosity, but code answers using L_Sun. |
|
watt SI |
W J*s^(-1) m^(2)*kg*s^(-3) |
W J*s^(-1) m^(2)*kg*s^(-3) |
Code power as W unless you specifically need J/s. Avoid using base units. |
See also: