Timer Practical
Scenario: A chef requires an egg timer which sounds a buzzer. The
buzzer needs to have an adjustable timer, so that different times can
be set for the egg to boil.
Method: To make an egg timer I will need to make a 555 timer with a
variable resistor to adjust the time set for the egg to boil
In order to do this experiment, I will need the following components
to make the timer:
Ø 9 volt battery
Ø Battery Snap
Ø Switch (s.p.s.t)
Ø 2x 10kΩ Resistor
Ø 0.1μF Capacitor
Ø 1mΩ Potentiometer
Ø 220μF Capacitor
Ø 680Ω Resistor
Ø Light Emitting Diode
Ø Buzzer
Ø PCB Board (Printed Circuit Board)
Ø Connector Wires - Red and Black
Ø 555 Timer + Holder
The tools I will require while making the timer are a soldering iron
and solder, a mini-pillar drill, and a sucker while making the Timer.
I will also need 2 different sized drill-bits according to the size of
the holes that I need to drill for the components to fit in.
After I have collected my components, I will follow the following
procedure:
Making the PCB Board
I will firstly remove the protective covering from the PCB Board. I
will then lay the master circuit film onto the U.V Light box, aligning
the PCB Boards on top. I will then close the U.V Box and leave it for
3 and a half minutes.
After this I will place the PCB board on into a developer. The
developer contains a developing solution which removes the silver
underneath the copper, which radiation has been previously projected
on. The developing solution will loosen the silver and copper
underneath the layer of the PCB board, which radiation has not been
projected on by the U.V Light Box.
After this, I will wash the PCB Board in water, to make sure the
solution is removed from the PCB Board.
To start the lab, we got an egg and placed it in different substances to see how the egg would react to the substances. The first day we weighed the egg before putting it in a cup of vinegar, the egg weighed 55.47 grams, we left the egg here for approximately forty-eight hours. The second day, the egg was still in the vinegar. The third day we moved it into the corn syrup where it stayed until the next morning, the egg weighed 76.66 grams.
treasure in this odd place. It is a music box, and one of the most beautiful things either
You have the container that protects and houses the product, the outer packaging and the shipping container, also known as the master carton. Your product packaging should consist of:
the lid of the Petri dish, beside the Petri dish in a polythene bag. I
floor. It sticks horribly and the pattern just enjoys it !All those strangled heads and bulbous eyes
under. It was nailed shut, but the nails had some give on one side where I could work
seems to me not to be the most important question. What sort of space is that
the usual folder. It determines the way we frame everything . . . the attitude
Or, If a Clock Ticks in a Forest and No One is Around to See it, Does Time Still Pass?
Set - in a modern kitchen, there are drawers all the way around and a
clock, paper, computer software, a computer and a picture frame with no picture yet, which is black and gray.
The motherboard is the computer's main circuit board as shown in figure 8. It's a thin plate that holds the CPU, memory, connectors for the hard drive and optical drives, expansion cards to control the video and audio, and connections to your computer's ports (such as USB ports). The motherboard connects directly or indirectly to every part of the computer.
mother board in it's proper places. Then you should put the floppy disk drive and
How efficient time management practices as a business student can help lead to a successful business career
Economics doesn’t count the ‘time’ among the factors of production so people make very little effort to see the accomplishment in a timeline or measure the success against available time. However, time is the most important resource in any kind of operation. This is because almost all other resources involved in a process can be created, acquired and replaced with other resource if a higher volume is needed but time can neither be created nor can one acquire it and replace it with a substitute from different sources. According to Peter Drucker, “Everything requires time. It is the only truly universal condition. All work takes place in time and uses up time.” The fact that all work takes place in time and uses up time crates the importance of time. And inelastic, perishable, irreplaceable, and unobtainable characteristics of the time put up the need for managing it. The ultimate result of time management of the manual workers leads to increased “efficiency”, whereas the result of time management of the knowledge workers is higher “effectiveness”. Efficiency and effectiveness are the foundation of an organization’s success and survival