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# Resistant series circuits PowerPoint PPT Presentation

Resistant series circuits. These circuits involve only resistors such as light bulbs Equivalent resistance is determined. Req = R 1 + R 2 + … Use V = IR to determine I. Calculate voltage drop across each resistor. Practice time. Series circuits. Resistant parallel circuits.

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

No current flows this way.

If we reverse the battery, what happens?

### 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.