Topic 3 - Devices and systems convert energy with varying efficiencies Flashcards
What is Chemical Energy?
Potential energy stored in chemicals.
What is Electrical Energy?
Energy transferred by movement of electrons.
What is Mechanical Energy?
Motion or potential to move. (Energy of something moving)
What is Thermal Energy?
Total kinetic energy of all particles.
What is Energy?
Ability to do work.
What is a Thermocouple?
Device which converts thermal energy to electrical energy.
What is a Electromagnet?
Coil of insulated wire which becomes a magnet when currrent flows through it.
What is Electric Fields?
Produced by electric charge.
What is Magnetic Fields?
Produced by electric charges which are in motion.
What are the 4 points of an Electrical Motor?
- Magnet - Along the outside
- Armature - Rotating shaft of the motor.
- Commutator - Broken ring which breaks and reserves flow of current.
- Brushes - Conducts electricity: Cell, battery, commutator
What is a Transformer?
Device which converts or changes electricity at one voltage into electricity at a contrasting or different votlage.
What is a Step-Up Transformer?
Increases voltage.
What is a Step-Down Transformer?
Decreases or reduces the voltage.
What is Electromagnetic Induction?
Creation of electric current in a conductor by changing or contrasting the magnetic field.
What is a Direct Curent?
Current which flows in only 1 direction.
What is a Alternating Current?
Current which flows back and forth 60 times per second.
What is the Formula for Power?
P = V x I
What is the Formula for Current?
I = P/V
What is the Fomrula for Voltage?
V = P/I
What is the Unit for Power?
Watts {W)
What is the Unit for Energy?
Joules (J)
What is the Unit for Time?
Seconds (S)
What is the Formula for Electrical Energy?
E = P x T
What is the Unit for Voltage?
Volts (V)
How do you find the kilowatts?
You divide the watts by 1000.
What are the 4 steps to solving the problem?
- Identify the known qualities.
- Indicate unknown quantity.
- Use correct formula.
- Solve the issue or problem.
What does power mean?
The rate which a device converts energy.
What is the Formula for Energy?
E = P x T
What is the Law of Conservation of Energy?
Essential or Fundamental principle which energy cannot be created or destroyed.
What is Efficiency?
Device (Ratio of useful energy which comes out of a device to the total energy which went in.
What is the Formula for Efficiency?
Percent Efficiency =
Joules of useful output
———————————- x 100
Joules of input energy
