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Electricity
Electricity

... There are several different types of supply system; the simplest is the two-wire system which may be fed with either direct current (d.c.) or alternating current (a.c.). These systems are normally used to supply small domestic installations. ...
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... two kinds of switch. A push switch is ‘on’ only as long as you are pressing it. When you turn on a toggle switch, it stays on, until you turn it off. Here are two pictures of switches—a doorbell switch, and a light switch. Decide whether each is a toggle switch or a push switch. ...
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... bit level by reducing the number of transistor in the conventional mirror adder (MA) circuit. We implement approximate but reduced arithmetic units; it gave us an extra layer of power savings than that of conventional low-power design techniques. This is results to the decreased logic complexity of ...
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Opto-isolator



In electronics, an opto-isolator, also called an optocoupler, photocoupler, or optical isolator, is a component that transfers electrical signals between two isolated circuits by using light. Opto-isolators prevent high voltages from affecting the system receiving the signal. Commercially available opto-isolators withstand input-to-output voltages up to 10 kV and voltage transients with speeds up to 10 kV/μs.A common type of opto-isolator consists of an LED and a phototransistor in the same opaque package. Other types of source-sensor combinations include LED-photodiode, LED-LASCR, and lamp-photoresistor pairs. Usually opto-isolators transfer digital (on-off) signals, but some techniques allow them to be used with analog signals.
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