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How does a video door phone ensure safety?

2019-03-14

You know, a video door phone with the smart access control system possesses the following funtions, which contribute to ensure safety, such as:

What is retina display?

2019-03-14

Retina is a display technique, which zip a great number of pixels into the display so that a high resolution and exquisite display comes true;

Why are all electronic devices supplied with negative power?

2019-03-14

It’s quite vital for all electronic devices to supply with negative power.

Is there another way other than solar and wind to generate electricity?

2019-03-13

Yes! The other ways that generate electricity like thermal power, tidal energy, nuclear power, etc. 1)Thermal power: Converting internal energy into electric energy; 2)Tidal energy: Converting mechanical energy into electric energy; 3)Nuclear pow

What instrument is used to measure air pressure?

2019-03-13

Generally, the following barometers are used to measure air pressure: 1)Mercury barometer; 2)Electronic barometer; 3)Boiling point barometer.

What is the difference between a camera and a telescope?

2019-03-13

The difference between a camera and a telescope: 1)The camera only shoots the nearby objects; While the telescope only observes the distant objects; 2)The camera shoots the real image;While the telescope is virtual image.

What is the purpose of zero-ohm resistance?

2019-03-12

In fact, zero-ohm resistor plays a conductive and connected role in the PCB board, which is similar to the function of an electric wire.

How do I test a resistor in a PCB board?

2019-03-12

In order to test a resistor in a PCB board: Generally, the resistor value will be relatively accurate when it is took down from the PCB board, or at least one terminal of the resistor is not soldered on the PCB board.

How do you accurately measure connector pitch?

2019-03-12

It depends on the shape of the connectors: 1)For the regular connector pitch: (All measured parameters of pitches-pitch’s diameter) / pitch numbers; Pay attention to the measurement error; 2)For irregular connector pitch: Two neighbouring pitches-pitc

How is gold used in electronics?

2019-03-11

Gold is a significant material in the fields of special industry, such as electronics, modern communications, aerospace, etc.

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