What is the relationship between heat and electricity. Please provide a metaphor.
Heat produced is to calories when food is digested, as heat produced is to joules when electricity flows through an electric resistance.
Why is it warm near an incandescent light bulb?
Because of the principle of light emission in light bulbs is coupled with thermal emission. The temperature of a substance increases and thermal energy is emitted as electromagnetic waves and as the temperature rises, visible light is emitted.
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, when the temperature drops near absolute zero, the atoms reach a state of rest. At this point, electrons are able to move freely without colliding with the atoms, and there is no resistance at all. In real life they're used for things with crazy high magnetic fields, like MRI's and Maglev trains. To make a metal superconductor, somehow bring aluminum to near absolute zero and voila! Superconductor extraordinaire!
What is Ampere's Law?
When current flows in an electric wire, a magnetic field with a circular pattern is generated around that wire. The magnitude of this magnetic field varies according to the strength of the current: if the direction of the current changes, the direction of the magnetic field also changes.
If current of the same size flows in the same direction in two electric wires placed side by side, what happens?
A magnetic field for twice the current is generated.
What happens if current of the same size flows in opposite directions in two electric wires placed side by side?
The two magnetic fields negate each other.
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