ENGR43-lab7a (1)

Ohm's Law states that the electric current flowing though a ________ is directly proportional to the ________. Select one: a. closed circuit --- total resistance b. closed circuit --- switch resistance c. open circuit --- supply voltage d. closed circuit --- supply voltage

A computer's power supply converts mains AC to low-voltage regulated DC power for the internal components of a computer. You are building a new computer. You are deciding which type of power supply to install. Which of the following definitions BEST describes a valid type of power supply? Correct Answer: A single-rail power supply provides one rail (PCB trace). This provides the best safety for the computer by providing a single point of shutdown in the event of a short circuit. Correct Answer: A single-rail power supply provides one rail (PCB trace) used to always provide equal wattage to all devices attached to the power supply. Correct Answer: A dual-rail power supply provides separate rails (PCB traces) used to provide equal wattage to the devices attached to each rail. Correct Answer: A dual-rail power supply provides separate rails (PCB traces) used to balance the power load between multiple circuits, which prevents any one circuit from becoming overloaded.

Which of the following statements about fluorescent lamps is correct? a. Fluorescent lamps have positive electrical resistance, meaning that the resistance increases with the flow of current. b. Fluorescent lamps can be operated without a ballast because they self-limit their current consumption. c. The ballast in fluorescent and HID lamps serves as a transformer to boost voltage and a choke to limit the flow of current. d.     Fluorescent lamps don’t need a higher voltage to initiate the electric arc.   e. Once an arc is struck in a fluorescent lamp, the ionized mercury vapor reduces its conductivity, limiting the flow of current.

Sir, I need more details. Thanks

As an electrical and electronic engineer, your manager has asked you to write a report for the attention of new employees, listing and describing the operation of safety devices that are commonly found offices and other industrial situations. The report should include all of the details in the task below.     Task   For the following application, list two electrical safety devices that can be used, and describe their operation:A office building lights made up of led bulbs

Centennial College - School of Engineering Technology - Toronto ELECTRONICS SHOP PRACTICES CHAPTER 7: SOLDERING TECHNIQUES 7,5 QUESTIONS 1. Which tools will you need for soldering? 2. What type of solder do we call the Eutectic Solder? 3. If the temperature is too high, the is bellow required, the solder joint will appear cold and silvery and will be of the contact may occur and circuit will not work. If the 4. A long and sharp will be of little use when soldering wires or 5. The iron should have a tip to prevent and should have a wattage rating of to Watts. 6. When soldering, apply heat solder will to both, the component lead and much more readily over the copper pad so that the 7. Keep the soldering iron tip and working surfaces wipe only before using and immediately. 8. Do not solder from a heated tip before off the iron. alternate applying the surface. 9. If tips become and wiping to being used. 10. Periodically. the tip from your tool and with a suitable cleaner for your skills.…

What causes the normal heating in electronic devices? Not things that cause an anormal disfunction like dust or something else, but the one thing that by default creates normal heat in a system. I mean the actual part of the device which creates that heat.

36. Electrical explosions directly into the face of a person working on or near energized electrical equipment can and will cause serious injury or death. OSHA laws and NFPA 70E have strict safety requirements for working on electrical equipment. The basic rules are to turn off the power before working on the equipment and to wear the proper type of nonflammable clothing. To further provide safety for the worker, the National Electrical Code has a requirement pertaining to arc-flash hazard warning. This requirement is found in a. 110.16 (A) b. 220.1 of the NEC C. 330.1 d. 410.5

Q4. Explain the operating principle of the circuit breaker and list the merits and demerits of the following circuit breakers: (10 Mark) (i) Air circuit breaker (ii) Oil circuit breaker (iii) SF6 circuit breaker (iv) Vacuum circuit breaker

Give five examples of situations or applications where electrical circuits are used

6. The “three-step” test method: a. Ensures an accurate result by taking a measurement three times. b. Requires three people, to independently measure a voltage. c. Means checking a meter on a known source, then making the actual measurement, then checking the meter again on the known source. d. Uses three meters as a “redundancy check.”