Everything Flashcards
5 advantages of a microcontroller are…
- upload programs onto it
- it is small so it allows devices that use it to be smaller
- it can do more than one thing
- it is updatable
- it lasts longer than alternatives as the software is updatable
a unidirectional flow restrictor and a resevoir together creat a pneumatic…
time delay
To calculate force in a single acting cylinder use the formula…
force = pressure x area
In engineering area is always measured in…
and pressure measured in…
mm2
N/mm2
To find the force of the instroke of a double acting cylinder use the same formula, force = pressure x area, but to calculate the surface area of the instroke side of the piston use…
effective area = piston area - piston rod area
Open loop
everything is manual
eg. a tap - you have to turn it on and off
Closed loop automatic
set it to do something and it will constantly adjust to carry it out
eg. fridge - set the temperature and it keeps it the same
Closed loop manual
it will carry out an operation but you have to adjust it to your prefered settings
eg. shower - turn it out and adjust temperature to your preference, then turn it off when finished
What are the 2 main types of gearing mechanism?
A simple gear train
+
A compound gear train
Formula for kinetic energy…
Ek = 1/2 mv2
Formula for potential energy…
Ep = mgh
Formula for electrical energy…
Ee = ItV
Formula for heat energy…
Eh = mcΔT
(c = specific heat capacity)
V1 / V2 =
R1 / R2
Vout =
R1 / Rtotal x Vsupply
Resistance in a parallel circuit formula:
1 / Rt = 1 / R1 + 1 / R2 + 1 / R3 ….
ΣCWM (sum of clockwise moments) =
ΣACWM (sum of anti-clockwise moments)
moment = (force x distance from pivot point)
Σ↑ (sum of upwards forces) =
Σ↓ (sum of downwards forces)
If the LDR is at the top of the voltage divider, it detects when it is…
Light
If the LDR is at the bottom of the voltage divider, it detects when it is…
Dark
The 4 types of motion are:
- Linear
- Oscillating
- Reciprocating
- Rotary
