Energy
What is the energy of heat called?
Thermal Energy
What energy transfers exist within a car?
Chemical potential to kinetic, eletrical, and thermal.
What is the first law of thermodynamics?
The law of conservation of energy.
What is the relationship between electricity and magnetism?
Describe the difference between a motor and generator in terms of energy transfer.
motor: eletric to kinetic
generator: kinetic to eletric
What is the energy of motion called?
Kinetic Energy
What is the energy transfer that happens in the human body, and where does the energy come from?
The transfer is chemical potential to eletrical to kinetic and chemical potential to heat. Energy comes from food.
Provide an example for the law of conversation of mass.
answers may vary.
Describe how to create an electromagnet.
coil a piece of wire around a piece of metal and run a current through the wire
What is the mechanical difference between an AC and DC motor?
AC motors have slip rings, DC motors have a split ring
Define energy.
The ability to do work
What is the energy transfer in the falling of object from an airplane?
What is the second law of thermodynamics?
Law of entropy
How can you increase the strength of the electromagnet?
Increasing the voltage and current
Describe the main components of the generator / motor.
Permenant magnets; Armature, Brushes, Commutator, Power source (either attached to a circuit or the armature)
What is the energy from the movement of electrons called? (Hint: there are two answers)
Eletrical Energy and Chemical Energy
Explain the energy transfers involved in a solar pannel powering a calculator.
Light energy to eletrical energy to light energy
Provide a short explanation of the law on entropy.
In a closed system, the amount of unuseable thermal energy (entropy) will spontaneously increase.
Describes what happens when the magnetic field of a current reverses in polarity.
The direction of the current will be reversed
Explain why the split ring would not work for an AC generator.
The split ring reverses the direction of the current everyhalf rotation - this would interfer with the reverse AC current, which ultimately produces the same magnetic field. therefore not turning the armature.
What the difference between potential energy and kinetic energy? Give an example of both.
Answers will vary.
Explain the principal behind a thermocouple and provide an example of a location that could have a thermocouple.
The thermocouple works due to the Seebeck effect - a difference in thermal energy between two metals creates a voltage relative to the temperature difference. Examples may vary.
Provide an example that demonstrates the second law of thermodynamics.
answers will vary
Describe three ways in which an electromagnet is better than a regular magnet.
It can be turned on/off ; you can adjust the strength of the magnetic field; you can reverse the direction of the magnetic field.
Explain how a natural energy source can be used to generate electricity through the use of a generator.
answers will vary