Introduction to Switching (Mod.3 Sect.3 Part 1)

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In a circuit, a _____ is a device that makes or breaks an electrical connection. switch
There are two basic groups of switches: ______ and ______. mechanical, electronic
______ switches are the basic, hand-operated type that contain no electronic circuitry. Mechanical
______ switches are electronic components that can be used as switches. (ex. diodes, FETs, SCRs etc.) Electronic
The _____ switch is commonly found on electrical appliances. This mechanical switch contains a slider with a metal contact on the underside. slide
Another type of mechanical switch is the _____ switch, which are commonly used as light switches. This switch contains a ball-shaped slider with a metal contact. When it's moved to the ON position, the contact rolls into position, completing the circuit (vice versa). toggle
The two main types of push-button switches are _________ switches and __________ switches. momentary action, push on/push off
The ________ push-button switch contains a spring that return the button to its original position after it's pushed. momentary action
Unlike the momentary action switch, the ________ switch doesn't contain a spring, so it remains in position when pushed on or off. push on/push off
The _____ switch is a type of momentary contact switch that's used for quick, repeated switching, or for setting of appliance functions. For example, this switch is commonly used in alarm clocks to set the time. tact
Another common push-button switch is the ______ switch. The push-button part of the switch "rocks" back and forth into the switch positions, and it may have either 2 or 3 positions. These switches are often seen on computer monitors and appliances. rocker
________ Switch - When the button is pushed, the circuit is completed and current flows for as long as the button is held in place. When it is released, the circuit is broken. Normally Open
________ Switch - When the button is pushed, the circuit is broken for as long as the button is held in place. When it is released, the circuit is completed. Normally Closed
________ Push-button Switch - This switch stays in either of 2 positions. A spring and latching mechanism holds the switch in the position selected until it is operated again. Two-position
_________ is used as a safety measure feature in some industrial electronic applications, and dangerous equipment such as saws. It is also very useful in electric cars. Dynamic braking
A DC motor acts as a voltage when its armature is rotated If the motor is batter-operated, the generated voltage can be used to (partially) recharge the battery. So when the switch is put in put in the RUN (on) position, the armature rotates and the device runs. To stop the armature rotation, the switch is moved to the STOP position. When this occurs, the generated voltage is connected across a low-resistance, high current that rapidly stops the motor. This is called __________. dynamic braking
The _____ switch is a two-position mechanical switch that can be moved to either the A position or the B position. A-B switch
In a _____ switch, a knob is used to dial the switch positions. rotary
________ switches are often used in industrial applications where the switch will be used often. These switches operate on the same principles as other switches, but they are larger and generally have higher current and voltage ratings. Heavy-duty
_____ switches are used on computer circuit boards, but they aren't electronic switches. The tiny buttons on these switches can be moved into various positions to determine the switch settings. They're sometimes used to match up computer terminals with printers and other peripheral components. Dip
_____ refers to the number of moveable contacts a switch has. Poles
_____ refers to the number of contact positions a switch has. Throws
All switches are rated or described according to the type of connections they have. The ratings describe the number of ____, the number of ____, and the current or voltage rating. poles, throws
The simplest type of switch is the _________ switch. The name means that the switch contains one moveable contact (1 pole) and can control one circuit (1 throw). single-pole, single throw (SPST)
A switch's ____ position is not considered a throw when referring to switch connections. OFF
The ___________ switch (aka A-B switch) contains one moveable contact and can controls two circuits. single-pole, double-throw (SPDT)
The ____________ switch has two moveable contacts and controls two circuits. The poles are mechanically connected, so they move at the same time. double-pole, double throw (DPDT)
The main disadvantage of mechanical switches is their ________. slow switching time
When a mechanical switch or relay closes, the switch elements will often bounce, even if only briefly, before making final contact. This is known as ________, and it can disrupt and (in some cases) destroy circuitry. contact bounce
A special circuit called a _________ can be used to prevent contact bounce. The switch holds the voltage at the value obtained with the first 0 t0 +5 transition, and allows a mechanical switch to be used in applications where operating speed isn't a primary requirement. bounceless switch
_______ is the study of how humans relate to their work environment. Ergonomics
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