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FAQ

i want to make a bulb on and off at intervals of say half an hour. readymade timers available in shops(india) costs much and does not support shorter intervals like half an hour. any cheaper electronic circuit which can do this control? from where can i get the circuit or its diagram?

Depending on your skills, a CMOS 555 timer chip could probably drive a solid state switch (triac) for this interval although a more reliable timing, especially if you want exactly a 50% duty cycle, by feeding the timer output into a counter, so that the 555 cycles say 32 times (once a minute about) for each change of state of the selected output. Smaller cycle times are more stable.

i need it pretty soon for my hw and if you dont mind can you explain what the process is thanks and keep it simple

Input is the source or something acted upon. Like the thermostat in the ac or heater system would be the input - telling the rest of the circuit that the temp is too low, therefor turn on the heat (or turn off the ac).

How does electrical copper wires aid to temperature rise?! I don't think it is also associated with carbon emission as carbon emission mostly come from vehicles and manufacturing industry.

It takes energy to send an electrical signal down a wire, and the longer the wire is, the more energy you will end up using as a result. So longer wire more energy wasted in the wire. As most electrical systems are powered by mains electricity, and they are in turn powered by fossil-fuelled power stations, longer wires more energy wastage more carbon emissions from the power stations. So, carbon emissions are lowered if shorter, and therefore less, wires are used. Also, copper has to be mined which causes local environmental damage as well as carbon emissions in the production and transport of the copper. as carbon emission mostly come from vehicles and manufacturing industry. The breakdown of carbon emissions is actually approximately 30% Heating, 30% Vehicles and 30% electrical power. As 30% of emissions are due to electrical power, clearly, using less electrical equipment would reduce carbon emissions, presuming that there is not a shift to fully renewable power generation such as wind and solar. EDIT: Spongebob, of course its a made up termwords don't just pop out of thin air you know. Still arguing against AGW James? We've moved on.

A. Identify only the primary source of electrical energy for the equipment or circuits in question.B. Enable backup energy sources, such as generators and batteriesC. Make sure all workers are safe and accounted for before equipment and circuits are unlocked and turned back onD. Avoid testing equipment and circuitry to ensure they are de-energized

picked B and got it wrong. :( its either D or C

I live in Houston texas and am planning on getting a degree in either electrical or mechanical engineering. What do they both involve? Which is better pay and more job offering?

Mechanical engnieering obviously! (And I'm not being biased at all .) But if you've taken Physics already, depending on the sections that you were good at or were interested in, you can tell which field is better for you. If you liked working with mechanical systems (i.e. forces, accelerations, kinematics, and predicting the motion / behavior of elements in a system) then you would love being a mechanical engineer. But if you found circuits and resistors inductors and capacitors fun (and not confusing at all), then you should lean towards electrical engineering.

electrical engineering

use a non contact heat detector. fluke and many others make units that can sense the IR radiation at the terminal and determine the temperature from it.

Conduct regular maintenance tests for the electrical equipment.The following actions should be taken to reduce the probability of potential electrical deficiencies at this facility.The Hazard

potential electrical deficiencies means the possibility that this facility will not work due to electrical problems in other words, future problems caused by lack of maintenance on the electrical equipment. Therefore, the sentence could be rephrased as follows: The following actions should be taken to to make sure all the electrical equipment stays in good working order.

(without using any connection wires)? I frequently need to plug existing electrical equipment in places where there is no power outlet I have to use clumsy long tailed electrical extension plug that hinders free movement ? Short of using a battery in the equipment how to connect the power junction points (earth live neutral to an existing electrical power outlet using nothing but air in between)?

Hmmm, for modest loads, you can use induction but that needs modifications to the equipment you are using AND needs the drive coils embedded in the walls of the building you are in. It does work quite well though :) Tesla had some quite good ideas about tranmistting power but again, the method is not something too practical to use in your everday building. Sorry :(