battery
The power supply provides electricity that support current to allow the component to run. For example: (The motherboard) the motherboard is useless without the help of power supply. Any component or hardware were useless without the power supply.
The computer will only consume what power it needs. No diffference. if you have a 350watt power supply, and it is using more then 70% power consuption, the life of that power supply will be short, so always aim big when picking out a power supply, ie: 50-100 watts more than what you would actually need.
You need to convert the voltage if your appliance requires less voltage than you power supply. example: appliances is 110V and power supply is 220V.
The supply won't have to work as hard. It is perfectly acceptable, for example, to use a 1A, 12v supply to supply a 12v, .5A load. The current rating indicates the ability of the supply to dissipate heat caused by the current flowing. If the load current is above the power supply current rating, the power supply will overheat.
Several power companies and independed authors have written excellent articles about universal power supply. Other than that, for example libraries offer books and catalogs on the matter.
i have a question? in the earthing system should we connect the negative pole of supply to the earth for example a +24 power supply?
A power supply fan keeps the power supply cool. The semiconductor components get hot in a switching power supply, and this fan keeps things cool and helps prevent the power supply from damaging itself from excessive heat. As an example, when you play games, the video card requires a lot more current. That means the power supply has to work harder. The switching transistors in the power supply have to operate at a higher frequency and pass electricity through them a higher percentage of the time. That in turn causes them to get hot. The fan helps pull this heat away and protects these components.
An example of a passive transducer is differential Transformers. The reason why is because passive transducers require an external power supply to operate.
A soft power supply refers to a supply with poorvoltage regulation, which is defined as the ability of a system to provide near constant voltage over a wide range of load conditions. For example poor power line voltage regulation (a soft supply) causes lights in a home to dim each time the refrigerator starts.
An uninterruptable power supply is a power device for a computer (or other things) which is designed never to lose power in the middle of crucial operations. For example, if you're running a computer which is in charge of a critical process and there is a disruption in the power coming into the computer, the uninterruptable PSU (power supply unit) is designed to make sure the computer doesn't stop the process it was working on and lose data.
An uninterruptable power supply is a power device for a computer (or other things) which is designed never to lose power in the middle of crucial operations. For example, if you're running a computer which is in charge of a critical process and there is a disruption in the power coming into the computer, the uninterruptable PSU (power supply unit) is designed to make sure the computer doesn't stop the process it was working on and lose data.
UPS = Uninterruptible Power Supply