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Resistant series circuitsPowerPoint Presentation

Resistant series circuits

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Resistant series circuits

- These circuits involve only resistors such as light bulbs
- Equivalent resistance is determined.
- Req = R1 + R2 + …
- Use V = IR to determine I. Calculate voltage drop across each resistor.
- Practice time.

Resistant parallel circuits

- These circuits involve only resistors such as light bulbs
- Equivalent resistance is determined.
- 1/Req = 1/R1 + 1/R2 + …
- Use V = IR to determine I. Calculate voltage drop across each resistor.
- Practice time.

Series RC circuits

- Equivalent resistance and capacitance is determined.
- Req = R1 + R2 + …
- 1/Ceq = 1/C1 + 1/C2 + …
- Use V = IR to determine I. Calculate voltage drop across each resistor.
- Use q = CV and divide by time to get current. We will not do this since current changes.
- Practice time.

Parallel RC circuits

- Equivalent resistance and capacitance is determined.
- 1/Req = 1/R1 + 1/R2 + …
- Ceq = C1 + C2 + …
- Use V = IR to determine I. Calculate voltage drop across each resistor.
- Use q = CV and divide by time to get current. We will not do this since current changes.
- Practice time.

Complex circuits

- Use same principles to isolate one equivalent resistance and reverse engineer solution to circuit.
- Lots of practice time to follow.

Kirchoff’s laws

- Voltage Law: The sum of all of the voltages around any closed loop must equal 0.
- Current Law: The sum of all currents in any node must equal 0.
- These may be used to help solve complex circuits.

Silicon chips

Silicon has no free electrons and makes a very good insulator.

Its large atomic radii make it ideal for doping.

Silicon doping

- N type semiconductors have phosphorus or arsenic put in the silicon matrix. With 5 electrons, they provide one unbonded electron each.
- P type semiconductors have boron or gallium put in the silicon matrix. With only 3 electrons, they result in a deficiency of electrons, or a hole.

Silicon doping

- Transistors use 3 layers of doped silicon, and can be PNP or NPN types.
- Current will not flow unless you apply a small current to the center section, in which case it amplifies the current flow.
- Transistors allowed the creation of the silicon chip and the microprocessor used in computers.

How are transistors used?

- To switch electronic signals between on and off positions. This is a simple logic circuit.
- To amplify the signal obtained. These are used in radios, TV’s, etc to produce volume.

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