Circuit lab practice tests
The first competition is at NCS on December 7th. Talk to your partner and let them know what the issue is and how you guys can fix it. As long as you keep in touch with your partner, and continue to work now that the break is over. As long as you have the item you built before your competition, you will be fine. If you still have concerns talk to Jason, since he knows the most about building events. Please talk to your team leader or a member of the senior leadership team.
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A complete circuit can be constructed in more than one way using the same materials. Different types of electric circuits show different behaviors parallel and simple circuits.
Electricity is the flow of electrons. These are termed loads. Two light bulbs on the same series circuit share the voltage of the battery: if the battery is 9V, then each bulb gets 4.
Two bulbs in a simple parallel circuit each enjoy the full voltage of the battery. This is why the bulbs in the parallel circuit will be brighter than those in the series circuit. Example: good holiday lights can have a bulb removed and the rest of the lights on the string will remain on.
Goal: Students will experiment with batteries, bulbs, and wire so as to understand the idea of a simple circuit. Students will become familiar with the use of wirestrippers, fahnstock clips, battery holders and bulb holders. Students will follow a series of questions that will allow them to create and identify series and parallel circuits.
Before class set up: Materials can be put into boxes so that the students begin with the very basic components and then add materials as they are required.
To start the lesson, each box should have: one piece of wire, one bulb, one D battery. It is useful to have some way to keep the bulb from being smashed by the battery—I used a cardboard divider and tape to make a small bulb compartment.
Bulb holders Battery holders. Wire strippers Paper clips Brad fasteners index cards. The students should not begin their Final Project until they have completed the checklist of experiments. By doing the checklist, they are learning the necessary skills to complete the project. It is a good idea for the teacher to have an assignment sheet for the Final Project and an Experiment Checklist sheet, so as to reference both while explaining the forthcoming lessons ie.. Check with the Learning Center teachers to determine which explorers might be easier to research.
Explain that they will be able to work independently, but there will be times when they will all have to direct their attention to the whiteboard or to the teacher for hints. For example, If they decide to put one wire to each end of the battery, it will get hot. They can try this for a few seconds, but they should know that 1.
Hopefully, we will find out why this occurs as we learn about electricity. The electrons have no load to cross, the result is heat energy. First Lesson: Give out a wirestripper and an experiment box. Explain that the wire is similar to an arm with a shirtsleeve covering it.
Have them notice the little notches on the wire stripper. These are what keep it from being a pair of scissors also the fact that they are not sharp. You can put the wire in these notches. Now, if we were putting a giant wire stripper over my arm, the goal would be not to cut the arm but to rip off the shirt sleeve thus leaving the arm bare.
So we have to put enough pressure on the stripper to grab the shirt, but not the arm underneath. It is the same with the wire and with some practice, everyone will soon be stripping wires. You only need to strip several centimeters of wire at each end.
The kids can now have the boxes—it is also time to give them the checklist and to go over it. Explain how you want their diagrams to look. If they know they have to have 8 diagrams, how can they set up their page ahead of time? What is too big, too small?
How do you label? What about name and date? As an extra credit challenge, you can have students design their own bulb holder. Hopefully, by the time they get to the bottom of the sheet, they will already have done a series and parallel circuit—yes, they have to do it again but, no diagrams Does a bulb get hot at your home?
Be careful--hot Are there different kinds of bulbs? What about the battery? Are there different kinds of batteries? What is inside of a battery? We have to be careful of that stuff—if you see a leaky battery, alert the teacher and wash your hands. The path of the electrons is like a car that travels a road and needs to get back to where it started in order for the light to go on.
Switches are like draw bridges in the road. Make sure that you cut the plug off of the string of lights and throw it away!!! Once children have cut sections of the wire apart, you do not want anyone plugging it in! These are the experiments you need to complete in school before you can start on your final project.
Draw diagrams to communicate the ways in which you solve the problem. Note: some diagrams may show methods that do not light the bulb. How many different ways can you light the bulb? Can you compare 2 different ways of wiring the bulbs so that in one way the bulbs are brighter than in the other way? Be creative. Solve the problem. Conductors or Insulators? Have you made a switch for a circuit yet? If yes, you may use that switch or you may wish to use the following idea:. One index card Two brass fasteners.
One paper clip Two wires. Poke the fasteners through the index card so that they are close enough to each other so that a paper clip can touch both of the fasteners. Now attach wires to the fasteners.
Now attach the paper clip to one brass fastener so that it can swing around and touch both brass fasteners. The paper clip should also be able to swing to a position where it is only touching one of the fasteners. Now take off the paper clip.
Now you have a Conductor Tester. Place items so that they touch both brass fasteners. Does the bulb light up? Make a list of 10 items that light up the bulb. They are Conductors -- they conduct electricity. Make a list of 10 items that do not light up the bulb. They are Insulators -- they do not conduct electricity.
Draw diagram of a series circuit. Make sure to label the following:. Draw a diagram of a parallel circuit. Your child will be working in class to create an electricity project that will focus attention upon explorers of the 15th and 16th centuries. Each child will be assigned a person to research. They must use their information to create an interactive exhibit that will inform the user about their individual explorer.
The students will be asked to use skills they will develop in science class to complete this project. They may create maps and draw illustrations, diagrams, or charts.
They may ask questions as long as they present answers. They must have a working series circuit or a working parallel circuit with a switch in their project. They must organize their information so that it is easy for the observer to understand the historical significance of their explorer.
They must write neatly and use size and color to their advantage. Some of the information they might include about the explorer:. Your children will be working on these projects during science class every day. You may wish to purchase some extra materials for them to work with.
Purchasing materials is not necessary for your children to successfully complete this project. Purchasing additional materials will allow them greater freedom to experiment on their projects. Batteries usually last through the duration of the project. Some students prefer 9volt batteries, as they are easier to mount onto their poster. The light bulbs tend to need to be replaced two or three times.
Holiday lights are an inexpensive and acceptable solution. LEDs are fun and make the project more attractive—they also present extra challenge and may need resistors. Battery holders are helpful.
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Almost every electronic device has one of these self-contained modules of complex interconnected electronic components, which include resistors, capacitors, transistors, diodes and fuses. Printed circuit boards can cover a single task or multiple functions. PCBs come in three major types:. The electronics industry drives toward more miniaturization, requiring design engineers to produce faster, smaller — and more complex — circuit board technology, which has a higher quality and costs less. It is important for a printed circuit board to perform its function and support the larger electronic device. Consequently, PCB manufacturers must have a system in place that monitors and tests each component to ensure that it meets various standards and delivers maximum performance. When a component fails, analysts must utilize various processes, tools and techniques.
Electrical Circuits Lab Viva Questions and Answers
Which of the following describes this circuit? Switches in series. Switches in parallel. Lamps in series. Fuses in parallel. Resistors in series. Resistors in parallel.
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Practical electrical and electronic circuits test questions
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Portola Pilot
Master the analysis and design of electronic systems with CircuitLab's free, interactive, online electronics textbook. Easy-wire mode lets you connect elements with fewer clicks and less frustration. Mixed-mode circuit simulation lets you simulate analog and digital components side-by-side. SPICE-like component models give you accurate results for nonlinear circuit effects. Human-friendly formats let you enter and display values concisely, just like you would on a paper schematic. Unit-aware expression evaluation lets you plot arbitrary signals of interest, such as differential signals or power dissipation. In-browser simulation and plotting lets you design and analyze faster, making sure your circuit works before ever picking up a soldering iron. Unique circuit URLs let you easily share your work or ask for help online.
PCB Failure Analysis
Mechanical Engineering 1. MCQ Practice Tests. Timed Mock Tests.
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A complete circuit can be constructed in more than one way using the same materials. Different types of electric circuits show different behaviors parallel and simple circuits. Electricity is the flow of electrons.
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