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 current flow and return in a home electric hot water heater? I only see two black hot wires and no white return wire.
Answer:
Your hot water heater is powered by 240 volt electric power through the two black wires. Each black wire is hot, meaning that its voltage fluctuates up and down significantly with respect to ground. In fact, each black wire is effectively 120 volts away from ground on average, so that if you connected a normal light bulb between either black wire and ground, it would light up normally. However, the two wires fluctuate in opposite directions around ground potential and are said to be "180° out of phase" with one another. Thus when one wire is at +100 volts, the other wire is at -100 volts. As a result of their out of phase relationship, they are always twice as far apart from one another as they are from ground. That's why the two wires are effectively 240 volts apart on average. Most homes in the United States receive 240 volt power in the form of two hot wires that are 180° out of phase, in addition to a neutral wire. 120-volt lights and appliances are powered by one of the hot wires and the neutral wire, with half the home depending on each of the two hot wires. 240-volt appliances use both hot wires.
--- >>>
More Questions:
  • What does voltage rise mean?
  • How does an internal voltage regulator type auto alternator work and are they any better than an external regulator type?
  • Why is a lottery winning called a “jackpot”?
  • Can I ride my bike or scooter anywhere or whenever I want to?
  • Can we predict earthquakes?
  • What are positive and negative g's?
  • Who discovered vaccination?
  • Who invented opera?
  • Why does my voice sound different to me when I listen to a recording of myself?
  • What is plant food from the nursery made of?
  • How did these navigations begin?
  • How does the Moon affect the ocean tides?
  • How were tape recorders invented?
  • Why do carbonated beverages "burn" your throat?
  • How long is a day on Mercury?
  • Why are Native Americans also called American Indians?
  • My nose sometimes bleeds while I play sports or after practice. Why?
  • How are plants different from animals?
  • Why do we call a cowardly person “yellow”?
  • How does the auto-focusing system on a camera work?
  • How does heat affect magnetism?
  • Do these homes have fireplaces, stoves, running water, and electricity?
  • What is dust, exactly, and why might it be bad for me?
  • When friction is made by two atoms rubbing it makes heat. But how and why?
  • Doesn't weight have resistance to acceleration?
  • Rules to play Checkers
  • Munshi Premchand
  • Ways Technology Makes You Stupid
  • Ways to Be a Better Parent
  • Incredible Amphibious Cars
  • Latest Blouse Design

  • Start a Hobby

    Writing

    Humans have occupied themselves by writing since 3200 BC you only need a computer or a pen and paper and you are away. Whether you like writing angry letters to the editor or want to work on writing the next War and Peace, you are not going to spend much money in the process .


    Chourishi Systems