Apple iPhone 5S and 5C review

Apple has launched the next generation iPhone 5S and a low end device 5C at its headquarters in Cupertino, California.

The new iPhone 5S powered by new Apple A7 processor and five times faster than iPhone 5. New device equipped to run 64 bit applications. While iPhone 5C comes with A6 processor.


iPhone 5S - Same look, small screen, big potential

The good: The iPhone 5S delivers an improved camera, a nifty fingerprint sensor, and a next-gen CPU and motion-tracking chip. Apple throws in the iWork app suite for free. iOS 7 adds some nice step-ups, too, including AirDrop file transfers and the Android-like Control Center.

The bad: External design is identical to that of the iPhone 5, including a 4-inch screen that looks downright tiny next to Android competitors. For now, the fingerprint sensor only works with Apple apps. The 64-bit A7 processor and M7 motion-tracking chip don't have killer apps yet. iOS 7 differences are potentially jarring for longtime iPhone users.

The bottom line: The iPhone 5S is not a required upgrade, but it's easily the fastest and most advanced Apple smartphone to date.


iPhone 5C will come with a polycarbonate shell and the option of a green, white, blue, pink, or yellow “soft-feel” silicon rubber surround.

How to check whether a SMPS is in working condition?

SMPS stands for Switched mode Power Supply. It gives power to all the components in your computer system.

If your computer is dead and even not a single lights glow on your Motherboard, the basic need is to check is SMPS. To do so, remove power cable from SMPS and unplug all connections of peripherals (Hard disk, Motherboard, DVD etc). Now you can check SMPS easily by connecting/shorting a small wire between green color(PS_ON) and adjacent black color wire (COM). After connecting, plugin power cable and switch on the SMPS. If SMPS fan runs, SMPS is working.

There are many other problem too, if computer is dead, but please try this step first.

Calculation of UPS or Inverter Backup

Before calculating the Battery Backup, let us know a few factors that vary battery backup.

For UPS with 875VA we can us a maximum load of 640 watts and 677VA we can us a maximum load of 540 watts. The main thing we have understand is that what ever may be the UPS wattage the battery backup will not vary. The battery backup will only vary depending on the battery Ah and the Usage Load.

To calculate UPS backup, We have a simple formula:
                      UPS Backup = Battery Ah * (Volts/Load) * (1/Powerfactor)

Example: Let us calculate the backup for a system UPS

Load is the usage power, suppose we are running a PC then the load is around 300 watts
Power Factor varies for device to device, the average power factor is 1.4
Voltage is the voltage of the battery. For a single battery the voltage is 12v. If the batteries are connected in a series   Voltage = 12 * no. of batteries.
Battery Ah is the battery ampere used for the ups, System UPS battery AH is 7

                     Then   Battery Backup = 7 * (12/300) * (1/1.4)
                                                       = 7 * (0.04) * (0.7)
                                                       = 0.19 hours
                                                       = 19 Minutes

Note: You can use the same formula for calculating the battery backup for home UPS or an INVERTER.