Know These Basic Things About Electronics

Explanation
LED stands for light emitting diode. This is a semiconductor device that emits light when an electric current passes through it. LEDs are commonly used in various applications such as lighting, displays, and indicators due to their energy efficiency, long lifespan, and compact size.

Explanation
The positive leg of a component or device can be identified as the longer one compared to the negative leg. This is a common convention in electronics, where the positive terminal is typically longer to make it easier to distinguish and connect correctly. Therefore, if both legs are the same size, it is not possible to determine which one is the positive leg.

Explanation
A resistor is an electronic component that is used to limit or control the flow of electric current in a circuit. It provides resistance to the flow of current, which helps regulate the amount of current passing through the circuit. This is important as it prevents excessive current from damaging other components in the circuit. Therefore, the correct answer is that a resistor resists the flow of current.

Explanation
When working with electronics, it is important to be careful with water because water can conduct electricity and cause short circuits or damage to the electronic components. Overhead powerlines should also be handled with caution as they carry high voltage electricity, and contact with them can result in electric shock or even death. Additionally, overloaded sockets can lead to overheating and electrical fires, so it is crucial to avoid plugging too many devices into a single socket to prevent overloading.

Explanation
A fuse tester is used to prevent accidents by ensuring that the fuses in electrical equipment are functioning correctly. It helps in identifying faulty fuses that may cause electrical malfunctions or even fires. By testing the fuses, potential hazards can be detected and resolved before any accidents occur. Additionally, testing faulty electrical equipment is another purpose of using a fuse tester as it helps in diagnosing and troubleshooting issues with the electrical system, ensuring the safety of both the equipment and the users.

Explanation
The battery used in the circuit is 9v. This is because the voltage requirement of the circuit is such that it can only be satisfied by a 9v battery. The other options, 1.5v, 4v, 0.9v, and 200v, do not meet the voltage requirement of the circuit. Therefore, the correct answer is 9v.

Explanation
The given answer lists several safety rules for soldering. These rules include: watching out for the heat, wearing an apron, wearing goggles, not breathing in fumes, and not touching the heat element. These rules are important to follow in order to prevent burns, protect clothing, protect the eyes from potential hazards, avoid inhaling harmful fumes, and avoid direct contact with the hot element, ensuring a safe soldering process.

Explanation
A PCB drill is the correct tool used to put holes in a circuit board. A coping saw is a handheld tool used for cutting curves in wood, while a pillar drill is a stationary tool used for drilling holes in various materials. However, when it comes to circuit boards, a PCB drill is specifically designed for precision drilling of small holes in the board without damaging the delicate components. Therefore, the most appropriate tool for putting holes in a circuit board is a PCB drill.

Explanation
The given answer options all refer to software programs used for drawing circuits on the computer. "Crocodile Clips" and "Crocodile Technology" are both popular software programs specifically designed for creating and simulating electronic circuits. "PCB Wizard" is another software program that is commonly used for designing and creating printed circuit boards (PCBs). Therefore, all three options are correct answers for the question.

Explanation
The first step of vacuum forming is to place the material that needs to be formed into the mould. This is done to ensure that the material takes the desired shape when the vacuum is applied.

Explanation
The answer provided correctly identifies three workshop safety rules: wearing an apron, wearing goggles, and no running. Wearing an apron helps protect clothing from spills or stains, while wearing goggles protects the eyes from potential hazards. The rule of no running is important to prevent accidents and ensure a safe working environment.

Explanation
The correct answer is "thermosetting and thermosets". Thermosetting plastics are materials that, once molded and set, cannot be reshaped by heating. They have a strong and rigid structure, making them suitable for applications that require durability and resistance to heat and chemicals. Thermosets, on the other hand, are a subset of thermosetting plastics. They undergo a chemical reaction during the molding process, resulting in a permanent and irreversible change in their molecular structure. This makes them even more rigid and heat-resistant than other thermosetting plastics.