What is the relationship between heat and electricity. Please provide a metaphor.
- Heat is produced when electricity flows through an electric resistance much in the way that the digestion of food produces heat. The heat produced by the electric resistance is called joules heat. Heat, or temperature, is essentially vibration, so when electricity flows through the resistance, it is similar in effect to when someone yells "fire" in a crowded room, creating panic, or in the case of the electricity, creating more vibrations.
Why is it warm near an incandescent light bulb?
- The bulb's electrical resistance generates heat and in turn heats the air around it. The heat takes the form of thermal emissions,
What is a superconductor? What are they used for in real life? You may have to look this up.
- A superconductor is a material with no electrical resistance. Aluminum is a superconductor when its temperature reaches near absolute zero
- Superconductors are used in MAGLEV trains, since they can be used to make extremely strong magnets. The train 'floats' on the magnet, which eliminates the friction between the train and the track.
How could one make a metal a superconductor?
- To make a metal a superconductor you need to cool it below a certain critical temperature.
What is Ampere's Law?
- The creation of circular magnetic fields around a wire when electricity floes through it.
- The direction of the current determines the direction of the magnetic field. This can be determined by using your right hand; with your fingers curled and your thumb sticking out in the direction of the current, your other fingers curl in the direction of the magnetic field.
If current of the same size flows in the same direction in two electric wires placed side by side, what
happens?
- The two magnetic fields generated in the two wires are combined to form one large magnetic field. A force of attraction is also created that causes the wires to attract each other.
What happens if current of the same size flows in opposite directions in two electric wires placed side by side?
- A force of repulsion is generated in the wires and the magnetic fields negate each other.
Please read about Flemings Left and Right Hand Rule. Think about this Rule with respect to the motors we have made this week.
- Fleming's left hand rule demonstrates how a conductor placed a magnetic field and current flows is affected by forces generated by the current or the field. When your left hand is bent into the unbeatable rock, paper, scissors combination trick your thumb indicates the direction of the conductor, pointer finger points in direction of magnetic field, and middle finger points in direction of current. A DC motor move by this force.
- Fleming's right hand rule is relevant to generators
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