What is the relationship between heat and electricity.
Please provide a metaphor.
When the electricity
flows through a resistance heat is generated. A metaphor is like when you are
driving it’s like the electric flow, traffic is the resistance, and heat is when
your able to drive progressively (and get to class on time).
Why is it warm near an incandescent light bulb?
It’s warm because of
the Thermal Emission. The thermal energy is emitted because the temperature of
substance increases.
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?
Superconductors are
materials that conduct electricity with zero resistance below a certain
temperature. Mercury was historically the first to show superconductivity.
“Magnetic-levitation is an application
where superconductors perform extremely well. Transport vehicles such as trains
can be made to "float" on strong superconducting magnets, virtually
eliminating friction between the train and its tracks.” You lower the pressure
and cool a metal to make a superconductor.
http://www.superconductors.org/uses.htm
What is Ampere's Law?
When the current flow
goes through the electrical wire magnetic fields are generated and create a
circular pattern. This is Ampere's Law.
If current of the same size flows in the same direction in two electric wires placed side by side, what happens?
They will be
attracted to one another.
What happens if current of the same size flows in opposite directions in two electric wires placed side by side?
They will resist one
another.
Please read about Flemings Left and Right Hand Rule. Think about this Rule with respect to the motors we have made this week.
It how the direction
of flow is controlled. The left hand rule is in charge of direction of the
current, the DC motors left hand force is in charge of the way the motor turns.
