Do You Know
Questions & Answers on General Knowledge.
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.
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.
Are there volcanoes on Venus?
What is the relative insulating value of various levels of vacuum? For example, how insulating is 1/2 atmosphere as compared to full atmosphere?
What is the worst hurricane on record?
Is there a simple rhyme to help recall how many days are in each month?
Why is listening in on a private conversation called “eavesdropping”?
How do the automatic doors at a supermarket know when to open and close? How do they work?
How does a transistor amplify an input signal in an audio amplifier?
Are flood lights incandescent or fluorescent? Why are they so bright?
What is the most popular rock and roll song in history?
Did dinosaurs communicate?
Why does breaking a wishbone determine good luck?
Why are the sides of a boat called “starboard” and “port side”?
Does water drain in the opposite direction in the southern hemisphere?
How long does it take a nail to grow?
On an X-ray result picture, why is the film in the background blue? Is this the only way it will show up? If so why?
Why is a special day called a “red letter day”?
What colour is the sky above Mercury?
What did the Chinese take to Japan?
What were the first musical instruments?
Does blowing on or waving a developing Polaroid picture actually speed up its development process?
How do you calculate the change in water pressure as the diameter of the hose changes?
When did men start shaving every morning?
How many moons does Venus have?
Why is it that the same transformers seem to always be hit by lightning?
Were there wars in ancient Mesopotamia?
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What to Eat in Gujarat
Dahi vada (also known as Dahi Bhalla in Punjabi and Urdu, Thayir Vadai in Tamil, Thayir Vada in Malayalam, Perugu Vada in Telugu, Mosaru Vade in Kannada, Dahi Bara in Oriya and Doi Bora in Bengali) is an Indian chaat, prepared by soaking vadas in thick dahi (yogurt). The hot deep fried vadas are first put in water and then transferred to thick beaten yogurt. For best results, the vadas are soaked for at least a couple of hours before serving. To add more flavor, they may be topped with coriander or mint leaves, chili powder, crushed black pepper, chaat masala, cumin, shredded coconut, green chilis or boondi. Sweeter curd is preferred in some places in India, especially in Maharashtra and Gujarat, although the garnishing remains the same. A combination of coriander and tamarind chutneys are often used as garnishments in addition to those mentioned above.