Grade 9 Science lab2

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 40 amp branch circuit is run a long distance requiring a voltage drop calculation which increases the copper ungrounded conductors from a #8 to a #3. What size is the copper equipment grounding conductor required to be?

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.…

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

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.

Four electricians are discussing wiring under raised floors in information technology equipment rooms. Electrician A says that wiring under the raised floor requires fire-resistant walls, floors, and ceilings between other occupancies. Electrician B says that wiring under the raised floor requires fire resistant halfway up the walls and floors between other occupancies. Electrician C says that the room must employ a disconnecting means that removes half of the power to all equipment in the room. Electrician D says that a disconnecting means isn't necessary for the room. Which of the following statements is correct? A. Electrician B is correct. B. Electrician D is correct. C. Electrician A is correct. D. Electrician C is correct.

In the figure, the ideal batteries have emfs ℰ1 = 25.0 V and ℰ2 = 0.500ℰ1, and the resistances are each 2.14 Ω. (a) What is the current in resistor 2? ______________A(b) What is the current in resistor 3? ______________A (please show the units when working through the problem so that I can follow it easier)

Estimate the length of conduit to perform the next bends. EMT will be bend using a hand bender. Provide your answer in inches (just the number) using up to 2 decimals. The picture shows two panels connected by a back-to-back 23.5" stubs EMT 3/4" 6.25 ft P

I need the answer as soon as possible

7- What is the uses of circuit breaker?

How Rth connected with the load resistance, explain.

Given the circuit shown in the figure, use the words “increases,” “decreases,” or “stays the same” to complete the following statements. (a) If R7 increases, the potential difference between A and E _____. Assume no resistance in the ammeter and the power supply (b) If R7 increases, the potential difference between A and E _____. Assume nonzero resistance in the ammeter and the power supply (c) If R7 increases, the voltage drop across R4 _____. (d) If R2 decreases, the current through R1 _____. (e) If R2 decreases, the current through R6 _____. (f) If R2 decreases, the current through R3 _____. (g) If R5 increases, the voltage drop across R2 _____. (h) If R5 increases, the voltage drop across R4 _____. (i) If R2, R5, and R7 increase, ℇ (r = 0) _____.

The load current in a system is 100 A. the short-circuit current for the smallest fault is     100 A. An overcurrent capable of carrying a current of 5 A continuously is to be used. (a) Suggest a suitable C.T. ratio                  (b) What will be the current for the smallest fault?            (c) Will the protective C.T be able to faithfully reproduce the fault current?

Define the term passive reference configuration. When do we have this configuration when using double subscript notation?

A semiconductor is a material that has _____ energy band gap. a)no b)wide c)narrow d)nuclear

Answer question clearly and fully. Make sure I can properly read out the steps. Include any and all equations used during the solving process.

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.