Warning: Cannot modify header information - headers already sent by (output started at /home/content/70/7481070/html/appsrc/doyouknow.php:18) in /home/content/70/7481070/html/header.php on line 20

Warning: Cannot modify header information - headers already sent by (output started at /home/content/70/7481070/html/appsrc/doyouknow.php:18) in /home/content/70/7481070/html/header.php on line 21
cExams.net
Do You Know
Questions & Answers on General Knowledge.

Question:
How does a stereo convert 110 volt electric current into the positive and negative current that is sent to power the speakers?
Answer:
A stereo contains a power supply that converts 110-volt alternating current into lower-voltage direct current. This direct current is ultimately when powers the speakers. The stereo's power supply first lowers the voltage with the help of a transformer. Alternating current from the power line flows back and forth through a coil of wire in this transformer, the primary coil, and causes that coil to become magnetic. Since the coil's magnetism reverses 120 times a second (60 full cycles of reversal each second), along with the alternating current, it produces an electric field—changing magnetic fields always produce electric fields. This electric field pushes current through a second coil of wire in the transformer, the secondary coil, and transfers power to that current. There are fewer turns of wire in the secondary coil than in the primary coil, so charges flowing in the secondary coil never reach the full 120 volts of the primary coil. Instead, more current flows in the secondary coil than in the primary coil, but that secondary current involves less energy per charge—less voltage. In this manner, power is transferred from a modest current of high voltage charges in the primary coil to a large current of low voltage charges in the secondary coil. Having used the transformer to produce lower voltage alternating current, the power supply than converts this alternating current into direct current with the help of four diodes and some capacitors. Diodes are one-way devices for electric current and, with four of them, it's possible to arrange it so that the alternating current leaving the transformer always flows in the same direction through the circuit beyond the diodes. The diodes act as switches, always directing the current in the same direction around the rest of the circuit. The capacitors are added to this circuit to store separated electric charge for the times while the alternating current is reversing and the diodes receive no current from the transformer. The capacitors store separated charge while there is plenty of it coming from the transformer and provide current while the alternating current is reversing. Overall, the stereo's power supply is a steady source of direct current.
--- >>>
More Questions:
  • Who was Matilda in the song “Waltzing Matilda”?
  • Why do tropical rain forests grow so many plants?
  • How do motion detectors work?
  • How do an ammeter and voltmeter work? Why must the former be connected in series while the latter goes in parallel?
  • How many eggs does A woman have?
  • How do fish survive in freezing water?
  • What is special about the Hawaiian group of islands?
  • Why is someone who challenges what appears to be an obvious truth called a “devil’s advocate”?
  • Is there a simple rhyme to help recall how many days are in each month?
  • Who were the first scientists to study air travel?
  • What will be the source of energy for vehicles 50 years from now?
  • What is a tsunami?
  • What happens when you accidentally microwave a metal fork, and then eat the food it was in?
  • If all the laws of physics always happen the same, then what relevance does the frame of reference have?
  • Which is the brightest known star?
  • Can an eagle see a mouse from two miles away?
  • How far does a seabird migrate?
  • How do you keep the nuclear bomb stable until you're ready to use it? (For example, on the way to Hiroshima)
  • How were the planets formed?
  • How do the thermometers with digital (electronic) numbers work?
  • Why does a peacock spread its tail?
  • My friend spends all his free time playing games online. Is he addicted?
  • Is the red light effect in xerographic copiers the same concept behind red lights in a darkroom? Does film have the same sort of properties?
  • Are fiddleheads and ferns related?
  • Which countries have the most neighbors?
  • Benefits of Peas
  • Most Terrifying Civilizations In the History of the World
  • Most Popular Cricketers Perpetually
  • Benefits of Lactuca
  • Emperor Ashoka
  • Best Romantic Places In India

  • Benefits of Mangosteen

    Tuberculosis

    Mangosteen fruit contains strong antibacterial and antifungal properties besides being highly effective in boosting weak immune systems. Its inhibitory action against harmful bacteria is effective for patients suffering from tuberculosis. Mangosteen juice is very tasty thirst quenching cool drink to beat summer heat.


    Chourishi Systems