REC II Exam Review - Unit 7

REC II Exam Review - Unit 7 Q. Logic circuits use ____ that respond to or produce signals that have more than two voltage levels. - ✔✔A. Digital ICs Q. Ohm's law is expressed as ______. - ✔✔A. I = E/R Q. For an OR lo ...

REC II Exam Review - Unit 7 Q. Logic circuits use ____ that respond to or produce signals that have more than two voltage levels. - ✔✔A. Digital ICs Q. Ohm's law is expressed as ______. - ✔✔A. I = E/R Q. For an OR logic gate where Switch A = 1 and Switch B = 0, the output will be ______ (ON/OFF). - ✔✔A. ON Q. How many paths does a parallel circuit have through which the electrical current can flow? - ✔✔A. Two or more Q. What are the advantages of using series circuits? - ✔✔A. They are easy to protect, they can be used to protect expensive equipment, and they can be used in security systems. Q. In parallel circuits, the total capacitance is equal to the ______. - ✔✔A. Sum of the individual capacitors Q. What is a circuit? - ✔✔A. The path through which current flows in order to do work. Q. Which of the following is not a type of switch: {Toggle, Zener, Push-button, Slide}? - ✔✔A. Zener Q. In a _______ circuit, each output device works independently of each other. - ✔✔A. Parallel Q. If resistance is added to a circuit, what effect does it have on the capacitor in that circuit? - ✔✔A. It increases its discharge time. Q. In what ways can electrical current be created? - ✔✔A. From a chemical reaction, by a generator, and from pressure on a quartz crystal. Q. What type of variable is the best choice for a single bit value? - ✔✔A. Char Q. For an AND logic gate where Switch A = 0 and Switch B = 1, the output will be _______ (ON/OFF). - ✔✔A. OFF Q. Analog sensors produce a variety of electronic signals (not just on and off). {True/False}. - ✔✔A. TRUE Q. How do you reset the hardware to run a program repeatedly? - ✔✔A. Turn the controller off and back on. Q. Resistance is equal to _______. - ✔✔A. Voltage divided by current (R = E/I). Q. A photoresistor is an electronic component whose _______ decreases with increasing light intensity. - ✔✔A. Resistance Q. How do LEDs differ from lamps? - ✔✔A. LEDs do not have an evacuated glass bulb, LEDs are more rugged and long lasting, LEDs are used to send command signals from remote controls. Q. How does a potentiometer differ from a regular switch? - ✔✔A. It can be set to more or less current flow because it is an adjustable control device. Q. What two steps do you need to perform before you can use the controls in the On-Line window? - ✔✔A. Download the On-Line code to your controller; Verify communications between your PC's COM port and the Vex Controller. Q. What is the correct order of programming steps? - ✔✔A. Write pseudocode, Choose and declare variables, Translate the pseudocode into programming language, Download the program to the controller. Q. What would you use in your program to make it check the value of a sensor over and over again? - ✔✔A. A "while" loop. Q. What are resistors used for in circuits? - ✔✔A. Resistors are used as loads in many circuits in order to add a necessary amount of resistance to a circuit. Resistors reduce the voltage in a controlled way (also known as conditioning) so that the correct voltage is provided to the output device. Q. Logic gates are like electronically controlled switches. They are either _____ or _____. - ✔✔A. On or off. Q. When measuring resistance in-circuit, the other devices in the circuit _______ the reading. - ✔✔A. influences Q. Continuity testing is commonly used to _______. - ✔✔A. Verify correct pin conditions, test for broken wires, test whether or not a circuit is connected. Q. Schematic and pictoral diagrams of circuits are _______. - ✔✔A. often used simultaneously Q. Encoders can be used as part of a feedback control system to determine _______. - ✔✔A. translation distance, velocity, and/or angle of a robot or robot part. Q. A _______ sensor provides feedback in the form of an ON or OFF electrical signal. - ✔✔A. Digital Q. On a breadboard, the terminal strips in the component connection area are connected _______. - ✔✔A. in columns Q. When measuring current, the meter is connected _______. - ✔✔A. In-circuit Q. For an NAND logic gate where Switch A = 1 and Switch B = 0, the output will be _______ (ON/OFF). - ✔✔A. ON Q. Match the quantity {Current/Voltage/Resistance} with it's unit of measure. - ✔✔A. Current = Amperes; Voltage = Volts; Resistance = Ohms. Q. What is electrical current? - ✔✔A. The migration of electrons from atom to atom through materials. Q. What does a diode do? - ✔✔A. Allows current to flow in one direction only. Q. How do you calculate resistance in a series circuit? - ✔✔A. Add the individual resistance values. Q. In a parallel circuit, the same voltage is applied to each device, but the _______ may be different. - ✔✔A. Current Q. For what purpose are capacitors used? - ✔✔A. Energy storage, to block DC and pass AC, as filters. Q. The current is the same through all devices in a series circuit, but the _______ is divided according to the resistance of each device. - ✔✔A. Voltage Q. For a NOR logic gate where Switch A = 0 and Switch B = 0, the output will be _______ (ON/OFF). - ✔✔A. ON Q. How do you calculate resistance in a parallel circuit? - ✔✔A. R = 1/(1/R1 + 1/R2 + 1/R3+...).