Why Nurses Are Key to Medical Innovation - Ben Gran - TED 16:13 What a Living Whale Is Worth -- and Why the Economy Should Protect Nature - Ralp 14:38 The Wheat Field That Could Change the World - Guntur V. Subbarao - TED 10:53 The Habit That Could Improve Your Career - Paul...
Electrified charging coils (线圈) will be buried under the concrete roads that will create a magnetic (磁性的) field on the surface of the road. This technology is similar to the technology used for developing wireless charging stations for tablets and phones. Cars will be fitted with a receiv...
Professor: Like I said you need a dark and clear sky to experience this and light pollution... Well why aren’t we taken a close look at these auroras. Male student: Alright. Professor: Uh, let’s start with solar activity and its interactions with earth magnetic field.See the sun as...
It’s a matter of social status. When we act overconfident, we confer a magical social status that women readily fall for. Belief in your own ability creates a reality distortion field, and women start to see you the way you see yourself. This is true regardless of whether that self-conf...
Current is simply a bunch of moving electrons, and moving electrons make a magnetic field. This is how electromagnets are made to work. This will be important to keep in mind as we zoom into the structure of atoms. Around the nucleus of the atom, where the protons and neutrons live, ...
But you don't have to wait for a storm to bring an electromagnet to life. A current is introduced, either from a battery or another source of electricity, and flows through the wire. This creates a magnetic field around the coiled wire, magnetizing the metal as if it were a permanent ...
Figure 1: Electromechanical relay: Current through the coil creates a magnetic field that moves the armature between the contacts Electromechanical relays support a wide range of signal characteristics, from low voltage/current to high voltage/current and from DC to GHz frequencies. For this reason,...
The needle shaped filings align with their long (north-south) axis parallel to the magnetic field, and show the direction of the magnetic field lines at each point. A piece of iron can be picked up with a magnet, even if it is originally non-magnetic. When the iron is placed near a ...
When the current jumps to unsafe levels, the electromagnet is strong enough to pull down a metal lever connected to the switch linkage. The entire linkage shifts, tilting the moving contact away from the stationary contact to break the circuit. The electricity shuts off. A bimetallic strip ...
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