What is the relationship between heat and electricity. Please provide a metaphor.
When current flows through a resistance and the temperature rises, heat is generated. For example, when you are swimming (the current flow is you are trying to swim) against the current (the current is the resistance) in the river, the hard you try the tired you get.
Why is it warm near an incandescent light bulb?
The incandescent light bulb warms, because the temperature of a substance increases and thermal energy is emitted as electromagnetic waves.
What is a superconductor? What are they used for in real life? You may have to look this up.
How could one make a metal a superconductor?
A superconductor is a material that can produce electricity, and the electrons can move without being obstructed by the atoms, which means the material’s resistance becomes zero. A good example of using superconductor in medical is Magnetic Resonance Imagery, MRI,use the small magnets inside the nuclei of the human body atoms to visualize what surrounds them (brain, muscles…). A metal can be a superconductor, when it is cold enough, near absolute zero.
What is Ampere's Law?
Ampere’s law relates magnetic fields to electric currents that produce them, which states that Magnetic fields are generated in a circular pattern around the wire.
If current of the same size flows in the same direction in two electric wires placed side by side, what happens?
If current of the same size flows in the same direction in two electric wires placed side by side, the two magnetic fields generated in the two wires are combined to form one large magnetic field, and the wires attract each other, which caused by a force of attraction.
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, which will cause the magnetic fields negate each other, then the magnetic fields disappear.
Please read about Left and Right Hand Rule. Think about this Rule with respect to the motors we have made this week.
The left and right hand rule explains the relationships of conductor, magnetic fields, and current flows. The left hand rule says that the index finger points in the direction of the magnetic field (N to S), the middle finger points in the direction the current moves, and the conductor moves in the direction indicated by the thumb, as a result of a force acting in the same direction. The right hand rule says that the flow of that current is in the direction of the middle finger of the right hand, the direction of the magnetic field is the direction of the index finger, and the direction of movement of the electric wire is the direction of the thumb.
If current of the same size flows in the same direction in two electric wires placed side by side, the two magnetic fields generated in the two wires are combined to form one large magnetic field, and the wires attract each other, which caused by a force of attraction.
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, which will cause the magnetic fields negate each other, then the magnetic fields disappear.
Please read about Left and Right Hand Rule. Think about this Rule with respect to the motors we have made this week.
The left and right hand rule explains the relationships of conductor, magnetic fields, and current flows. The left hand rule says that the index finger points in the direction of the magnetic field (N to S), the middle finger points in the direction the current moves, and the conductor moves in the direction indicated by the thumb, as a result of a force acting in the same direction. The right hand rule says that the flow of that current is in the direction of the middle finger of the right hand, the direction of the magnetic field is the direction of the index finger, and the direction of movement of the electric wire is the direction of the thumb.
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