1. Analyzing & Building Electrical Circuits

2.  Predict the effects of switches, resistors and other circuit diagram symbols.  Draw circuit diagrams for toys, models, and household appliances.  Compare and contrast micro-electronic circuits and in a house. Learner Outcomes:

3. Shrinking Circuits

5.  To connect all the components in a circuit is in a simple loop.  What could be a problem with a simple loop? The most economical way…

7. Engineers & designers use schematic diagrams. Circuit Drawings

8.  That show the components and connections clearly.  These symbols make it easier to plan and analyze a circuit before you build it. Special Symbols

9.  All circuits have 4 basic parts:  Sources  Conductors  Switching Mechanisms  Loads Parts of a Circuit

11.  Provides energy and a supply of electrons for the circuit. Source

12.  Provides a path for current. Wires are drawn as straight lines in a schematic diagram. Conductor

13.  Controls the current flow- turns it on and off, or directs it into different parts of the circuit. Switching Mechanism

14.  A load converts electrical energy into some other form of energy. Load

16. Series Circuit

17. Parallel Circuit

18. Combination Circuit

19. Comparison Series Circuit  If pathway is interrupted, the whole circuit cannot function.  Adding components increases the total resistance of the circuit. This means that adding an extra bulb to a string of lights makes all of the bulbs dimmer. Parallel Circuit  Interruption or break in one pathway does not affect the rest of the pathways in the circuit.  Adding a new pathway does not affect resistance in other pathways- in fact, adding extra resistors decreases the total resistance of the circuit.

20. Adding more paths for the current means less total resistance.

21.  Do have an important use- in houses for example, switches are wired in a series with other components (wall plugs, lights) which makes it possible to turn off all the electricity in the circuit.  You must use a series circuit for switches. Series Circuits

22.  Household wiring is one of the many applications that use parallel circuits.  You wouldn’t want your refrigerator to go off if a bulb burned out, would you? However…

23.  A switch in one branch of a parallel circuit only controls the devices in that branch.  A switch in a series with all the branches controls all of them.

24.  Regular switches are practical and convenient for your home, but what is used in tiny circuits like those used in advanced electronics? Microcircuits

25.  Solid State- made of solid material with no moving parts.  Most are made with 3 layers of specially treated silicon.  A small voltage through the middle layer controls a current between the outer layers (in this way transistors can act as switches). Transistors

26.  Are made up of microscopic transistors and resistors.  They are circuits on extremely small scales.  The latest microcircuits contain more than a million components in a square centimetre. Microcircuits (Integrated Circuits)

27.  Page 316, 1-11  Due Monday, March 21, 2015 Check & Reflect