Get Started. It's Free
or sign up with your email address
Physics by Mind Map: Physics

1. Efficiency

1.1. Is the ratio of the useful energy that comes out of the device to the total energy that went in. Percent of efficiency= E out/ E in x 100

2. Renewable resource

2.1. One that can be reused more than once (eg. Sun and wind)

3. Conductor And insulator

3.1. conductor

3.1.1. Material that allows electrons to change position (Eg. Copper wire)

3.2. insulator

3.2.1. Solid, liquid, or gas that blocks movement of electrons (Eg. Rubber)

4. Non-renewable resource

4.1. Non renewable: One that can't be replaced once it's used up (coal, Oil)

5. Potential energy

5.1. Measured by a voltmeter

5.2. Energy stored in an object

5.3. Also known as Voltage or Volt

5.4. The difference in electrical potential energy between 2 points in a circle

6. Safety device for electricity

6.1. Fuse: is a safety device that has a low melting point. If the electrical gets dangerously hot the fuse melts on to the circuit stopping the flow

6.2. Circuit breaker: Same thing as a fuse but instead of melting it has a a spring mechanism that turns off the electric flow when the wires get to hot

6.3. Three-Prong Plug: The third prong connects the device to the ground wire of the building, this sends any unwanted current flow directly to the ground

6.4. GFCI: Ground Fault Circuit Interrupter  is a device that when it detects a change in current it opens the circuit which stops the current flow.

7. Static

7.1. it's an Electric charge that  builds On the surface of the object

7.2. Static electricity

8. Low and high  resistance

8.1. Low: Metals

8.2. High: All substances resist electrons

8.2.1. When a current resist electrons it causes it to heat up and produce light

8.3. Resistance

8.3.1. Measured in Ohms and by an Ohmmeter

8.3.2. Example: Light bulb filament

9. Short circuit

9.1. An accidental low resistance  connection between 2 points In a circuit

9.2. Short circuits are dangerous because the conduction wires can be very hot

9.3. But It can be useful by allowing technicians to work on the device without interrupting the circuit

10. AC/DC

10.1. Current is measured in Amps by a device called an ammeter

10.2. Alternate current (AC) : Flows back and forth at regular intervals called cycles

10.3. Direct current(DC) : A current that flows in one direction

11. 2 kinds of circuits

11.1. series

11.2. parallel

12. Induction

12.1. Within a substance caused by a nearby  charged object, without direct contact between the substance and the object and the subject

13. Generators

13.1. Transform the energy of motion into electric current, the magnets inside the generator are rotated by a turbine

14. kw*h

14.1. Means Kilowatt per hour

14.2. Measures the amount of electrical energy consumption

14.3. 1kW= 1000W

15. Calculating unknown quantity of volts, current and resistance

15.1. Known: V, I  Unknown: R

15.1.1. R=V/I

15.2. Known: I   Unknown: R

15.2.1. V=IR

15.3. Known: V  Unknown: I

15.3.1. I=V/R

16. Static electricity rules

16.1. Opposite charges attract

16.2. Similar charges repel

16.3. Only electrons move from one object to another

17. Electrochemical cell

17.1. Made out of 2 parts, 1 electrolyte and 2 electrodes

17.1.1. Electrolyte:                                                         Is a liquid or a paste that conducts electricity because it contains chemicals that form ions

17.1.2. Electrodes:                                                       Are metal strips that react with the electrolyte

18. Law of attraction And repulsion

18.1. Law of attraction

18.1.1. Particle with opposite charge attract

18.2. Law of repulsion

18.2.1. Particles with the same charges repel

19. Factors that affect resistance

19.1. Length: Longer wires offer more resistance

19.2. Temperature: If it increases so does the resistance

19.3. Material: Copper has low resistance rubber has high resistance

19.4. Cross sectional wires:Wider wires offer less resistance

20. Alternate sustainable to generate energy

20.1. Solar farm: Mirrors that focus sunlight onto a liquid that is heated and used water into steam to drive the turbines

20.2. Tidal: uses the energy of the powerful tides from the bay to spin the turbine

20.3. Wind: Uses the energy of moving air to spin the  generator

20.4. Solar cell: has 6 layers to capture electrons

21. Wet cells, dry cells, and fuel cells

21.1. Dry cell: An electrochemical that uses a paste  Instead of a liquid electrolyte

21.2. Wet cell: An electro chemical cell that has a liquid electrolyte

21.3. Fuel cell: Is an electro chemical cell that generates electricity directly from a chemical  with a fuel