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GCSE: Systems and Control
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- Marked by Teachers essays 1
LED's Designed LED layout 20/04/03 Made on Crocodile Clips Full Testing Put all stages together to test 09/05/03 Stage 1 : Clock source 555 timer The 555 will generate the clock pulse need for later on in the circuit. The 555 is commonly used as either a monostable or an astable multivibrator. The circuit I will be using to generate the clock pulse is shown below: I have tested the frequency of this circuit and it is 2000Hz I think that this is too slow and I want a fast frequency.
How does the central heating know when to turn itself off? What exactly happens when the fridge door is opened? Why do petrol pumps stop when the cars tank is full?
The GCSE Design and Technology Systems and Control introduces you to the designing and making of products which use mechanisms, computer control and electronics to modify or control processes. You will learn how materials and components can be designed, developed and utilised to control systems in a wide variety of contexts. You'll typically cover product analysis, commercial manufacturing processes, materials, electronics, mechanisms, computer controland the use of CAD and CAM. The subject will furnish you with the knowledge to study the subject at Advanced level or as a good preparation for further study inElectronics. Marked by Teachers has a great range of GCSE Systems and Control answers which you can study to gain a valuable insight into how questions in the subject can be interpreted, planned and answered.
Good conclusions usually refer back to the question or title and address it directly - for example by using key words from the title.
How well do you think these conclusions address the title or question? Answering these questions should help you find out.
- Do they use key words from the title or question?
- Do they answer the question directly?
- Can you work out the question or title just by reading the conclusion?
Test and evaluate a linear position sensor, and identify a possible use for this sensor in every day life.
From this experiment we can see that using a linear position sensor in a potential divider circuit gives an output P.D or voltage, relative to the changes in resistance, in response to the environment. An increase in the force applied to the sensor's mechanical contact is associated with a decrease in the resistance of the sensor, and so the output P.D or voltage also decreases.
In light of this experiment, and other background research of this sensor, I believe that a contact linear position sensor would be ideal for automotive applications. This is because there needs to be a constant track of the positions of the engine compartments, especially the movement of the engine's cylinders and pistons, and this sensor is protected against an engine compartment environment, (such as high temperatures), which can be harsh. It is also cost-effective, with a long endurance life, and can be 'tailored' and configured to fit the customer's needs or specifications.
Here is a picture of the linear position sensor used in my experiment
By: Scott de Silvia"