Techparticipant presents Electronic concepts :In this post, you will read about other Electronic concepts by which you will able to
define voltage and power
Identify voltage and power requirements for different hardware devices.
Voltage and Power(fundamentals of electronics)
Voltage is the potential difference between a negatively charged component and a component with a positive charge.It is the “energy per unit charge”. It is measured in volts.
Power is the amount of electrical energy one unit time given by an electric circuit. measured in watts (W) or joules/second.
Voltage and power requirement by hardware devices(fundamentals of electronics)
A computer is an electronic machine, hence it can only be operated with a source of energy. It needs standard power and voltage range for its operation. Every electronic device or circuit is feed by the power supply unit(PSU).
Computer power supply voltages(fundamentals of electronics)
All hardware components present in a computer, require some amount of DC voltage to function. This amount may differ from a component. The following table lists a few components and their voltage requirement:
|Component||Voltage requirement(in volts)|
|Mainboard or motherboard||12|
So, in a computer broadly three types of DC voltages are required, which are+12V, -12V,+5V,-5V and +3.3V.
Power ratings and voltage outside the permissible range can cause system failure.
A PSU draws the AC voltage from the source(generally from the socket) and converts it to the desired level of DC voltage. The following figure lists the parts found on the backside of PSU:
A point of connection for connecting the power cord to the computer.
A fan opening for drawing out the air from the power supply.
A red switch for changing the voltage of the power supply.
A rocket switch for turning on and off the power supply.
The following image shows a PSU:
There are different types of power supplies available in the market, but switched-mode power supplies are globally used today in personal computers.
There is also a stack of different colored cables inside a PSU.
The following figure lists the color codes of the PSU cables:
- These wires are used to provide grounding.
- Every other color should be paired with a black wire.
- These wires denote +12V
- These wires denote -12V
- These wires denotes +5V
- These wires denote -5V
- These wire denotes 3.3V
- These are control wires to check the DC voltage
- These wires denote+5V on standby mode