what is the effect of theory of relativity in our life?

The reverse is often said to be true for a twin who spends time high on a mountaintop — general relativity predicts that time passes more quickly at greater altitudes because objects don't feel the Earth's gravity quite as strongly. The physicists found that a twin who lives just about a foot above sea level will age ever-so-slightly faster than a twin living at the beach, too. The physicists used an atomic clock, which fills a large dining room table, that works by calibrating the frequency of a laser to that of an aluminum ion. The laser's oscillations are the equivalent of a traditional clock's ticks, but they occur far more rapidly — over a million billion times per second. That's about 100,000 times faster than the tick rate of the microwave-based atomic clocks that currently set the time standard in the United States. The effects they measured are infinitesimally small. The physicists reported that a clock positioned about two-thirds of a mile above an identical clock near the Earth's surface will speed up only enough to tick out three extra seconds over the course of a million years. "During your daily life, you experience relativity," said James Chin-Wen Chou, a postdoctoral researcher at the National Institute of Standards and Technology in Boulder, Colo., who led the experiments. "This (makes) science resonate with regular people." read less

Just a few years ago most televisions and monitors had cathode ray tube screens. A cathode ray tube works by firing electrons at a phosphor surface with a big magnet. Each electron makes a lighted pixel when it hits the back of the screen. The electrons fired out to make the picture move at up to 30 percent the speed of light. Relativistic effects are noticeable, and when manufacturers shaped the magnets, they had to take those effects into account. read less

In our daily life we are moving with velocities much less than the velocity of light. Therefore we don't feel the effect of special theory of relativity. But if you are moving with velocity comparative to velocity of light then you may see many effect like length contraction, time dilation etc. if you talk in general about the theory of relativity then i would say that every physical phenomena is relative.. for example when we move forward, we see that other objects are going back. read less

one best and famous example are on Electromagnets Magnetism is a relativistic effect, and if you use electricity you can thank relativity for the fact that generators work at all. Electrical Transmission Towers [Pin It] Credit: long8614 | Shutterstock.com View full size image If you take a loop of wire and move it through a magnetic field, you generate an electric current. The charged particles in the wire are affected by the changing magnetic field, which forces some of them to move and creates the current. But now, picture the wire at rest and imagine the magnet is moving. In this case, the charged particles in the wire (the electrons and protons) aren't moving anymore, so the magnetic field shouldn't be affecting them. But it does, and a current still flows. This shows that there is no privileged frame of reference. Thomas Moore, a professor of physics at Pomona College in Claremont, California, uses the principle of relativity to demonstrate why Faraday's Law, which states that a changing magnetic field creates an electric current, is true. "Since this is the core principle behind transformers and electric generators, anyone who uses electricity is experiencing the effects of relativity," Moore said. Electromagnets work via relativity as well. When a direct current (DC) of electric charge flows through a wire, electrons are drifting through the material. Ordinarily the wire would seem electrically neutral, with no net positive or negative charge. That's a consequence of having about the same number of protons (positive charges) and electrons (negative charges). But, if you put another wire next to it with a DC current, the wires attract or repel each other, depending on which direction the current is moving. [9 Cool Facts About Magnets] Assuming the currents are moving in the same direction, the electrons in the first wire see the electrons in the second wire as motionless. (This assumes the currents are about the same strength). Meanwhile, from the electrons' perspective, the protons in both wires look like they are moving. Because of the relativistic length contraction, they appear to be more closely spaced, so there's more positive charge per length of wire than negative charge. Since like charges repel, the two wires also repel. Currents in the opposite directions result in attraction, because from the first wire's point of view, the electrons in the other wire are more crowded together, creating a net negative charge. Meanwhile, the protons in the first wire are creating a net positive charge, and opposite charges attract. read less