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.…

Multiple Choices: Choose the BEST answer for each item. It states that the total current directed into a junction must be equal the total current directed out of the junction. Loop rule Junction rule     c. Resistance           d. Capacitance It happens when the direction of the current is directed towards a higher potential region to a lower potential region. Voltage drop Voltage rise       c. Current drop    d. Current rise It is necessarily to find ______ of current to solve the circuit according to the Kirchhoff’s Laws. value direction           c. symbol              d. speed In any closed path of a system the algebraic sum of IR is equal to the E.M.F of same path.   True False                 c. either a or b        d. none of these In any system, the algebra sum of the currents meeting at a junction point is zero, which is stated in Kirchhoff’s Current Law.   True False                 c. either a or b        d. none of these

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)

The circuit diagram below is for a robot that walks around the room. It is designed to stop walking when certain conditions are met.   a) In which of the following cases will the robot start walking? i. The robot is far from the wall. ii. The battery status is good. iii. The room lights are on. iv. Both i and ii. v. i, ii, and iii. vi. ii and iii, but not i. vii. i and iii, but not ii.  b) Explain what happens to the robot if the light is turned off. ______________________________________________________________________________ ______________________________________________________________________________  c) If you remove the light sensor and the AND gate attached to it from the circuit from the circuit, which of the following are true and which are false? i. The robot will continue to walk with a low battery ii. The robot will stop walking if it is close to the wall iii. One of the remaining inputs (proximity sensor and battery status) is irrelevant to whether the robot walks or not.…

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

For Figure 1 switch circuit: a. derive the switching algebra expression that corresponds one to one with the switch circuit. b. derive an equivalent switch circuit with a structure consisting of a parallel connection of groups of switches connected in series. (Use 9 switches.) c. derive an equivalent switch circuit with a structure consisting of a series connection of groups of switches connected in parallel. (Use 6 switches.) B' Figure 1. Switch Circuit

Using the diagram below and the component photos from page 4, draw the realistic experimental setup you will use in this lab.   Draw the actual apparatus with wires and other electrical elements, connected as they will be on your lab table.  Be sure to label components, junctions, and distances as appropriate.

Typing format..

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) _____.