Resistance Capacitance
2009
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Resistance Capacitance
Resistive Touch Screen Mobile Phones
If you think all touch screen mobile phones are the same you are sadly mistaken. With the pace of technology growing by leaps and bounds the ways and means that are developed for touch screens is amazing and slowly phones with buttons are becoming phased out by the new phones on the block. There are three main types of touch screen mobile phones: resistive touch screen, capacitive touch screen and Infrared touch screen.
Resistive touch screens can be used with any object touching the screen. More pressure is required to press the button compared to the other two types. How the resistive touch screen works is: there are two layers of the screen, electricity flows through both layers and when you touch one layer it must contact the other and the information associated with the touch is sent to the processor of the phone.
Capacitive touch screens come in two different types, the first type can recognize multiple touches at the same time while the other cannot. How they work is simple, they must be touched with something that has a flow of electricity, such as a human finger. When the current changes its flow, the processor of the phone is notified of the change and pinpoints the area of contact. These types of screens cannot be worked by just any object, the object must have some flow of electricity going through it to function. For those not in the know, capacitive touch screens can be mistaken as heat sensitive screens because of this fact.
Infrared touch screens are the most expensive type of touch screen, but they also provide the most sensitive type of screen. Infrared touch screens come in two types, optical and heat sensitive touch screens. Optical work with the typical infrared rays and a gentle touch will register in the processor of the phone to locate where you've touched the phone. The heat sensitive touch screen will do basically the same thing, except it responds to the warmth of whatever is touching the screen. This can be a drawback on a cold day however.
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A series circuit contains an inductance of 25 millihenrys, a capacitance of 40 microfarads and resistance of 5?
A series circuit contains an inductance of 25 millihenrys, a capacitance of 40 microfarads and resistance of 50+ohms.What is the impedance of this series circuit @159 ohms? Could someone give me the complete solution. Thanks.
You must mean 159Hz. Start by finding Xc = 1 2(3.14)(fc) which is 25ohms. Then Xl = 2(3.14)(FL) = 25ohms. You really did not even need to do the math. From here we can clearly see this circuit is at resonance. Xl=Xc, Z=R when a circuit is in resonance. So impedance equals the resistant so therefore the impedance is 50+ohms. Here is what it looks like if we keep solving. Xnet = Xl - Xc and they are the same and cancel each other out and equal 0. So Z= The Square root of R^2 + Xnet^2 giving us 50ohms which is the same as the resistance. A circuit is consider at resonance when Xl = Xc.
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