This is how relays work: they use a small electric current to trigger a much bigger one.How relays work Here are two simple animations illustrating how relays use one circuit to switch on a second circuit. When power flows through the first circuit (1), it activates the electromagnet (...
When you feed in DC, the electromagnet works like a conventional permanent magnet and produces a magnetic field that's always pointing in the same direction. The commutator reverses the coil current every time the coil flips over, just like in a simple DC motor, so the coil always spins in...
Explain what is a pseudo force? Include an example. What do you understand by the e.m.f. of a cell? Explain polyphase current? How can you explain work, in regards to electricity? A person who works with large magnets sometimes places her head inside a strong field. She reports feeling...
Explain why a soft-iron core increases the strength of an electromagnet. Explain how and why the ferromagnetic domains formed. Draw a typical B-H loop and describe the different magnetization processes that lead to the formation of the...
Artwork: How an oscilloscope draws a sine wave. 1) Inside the cathode-ray tube (CRT), the electron gun (yellow) fires a beam of electrons (green dots) toward the phosphor screen. 2) With no signal connected to the scope, a timing circuit powers electromagnet coils (blue) that make the...
Two pairs of electromagnet coils, shown here in red and blue, are energized in turn by an AC supply (not shown, but coming in to the leads on the right). The two red coils are wired in series and energized together and the two blue coils are wired the same way. Since it's AC, ...
In this lesson you'll be learning how to conduct an electrostatic induction lab. By the end of the lab you'll have a better understanding of how charges rearrange during electrostatic induction and how this can be applied in physics. Related...
Explain how does the rotation of the Earth makes a body weigh more at the poles than at the equator. Weight at the Surface of the Earth The gravitational force at the surface of the Earth is equal to the weight. This force pulls us down to the surfa...
Coil: This becomes an electromagnet whenelectricityflows through it. Transparent plastic cone: This makes the sound when it moves. Sponsored links How bigger headphones work As you might expect there's nothing radically different inside bigger headphones: they're just a scaled-up version of what ...
Here's how a basic motor works...You take a ring-shaped magnet, put a coil of wire inside it, and feed electricity through the wire. The wire becomes a temporary magnet powered by electricity—an electromagnet, in other words—and the magnetic field it creates repels the field from the ...