Unit 6 Series Circuits

1
Unit 6 Series Circuits

• Objectives
• Discuss the properties of series circuits.
• List three rules for solving electrical values of
  series circuits.
• Compute values of voltage, current, resistance,
  and power for series circuits.
• Compute the values of voltage drop in a series
  circuit using the voltage divider formula.

2
Unit 6 Series Circuits

• A series circuit has only one path for current
  flow.

3
Unit 6 Series Circuits

• Fuses and circuit breakers are connected in
  series. All the circuit current must flow through
  the fuse. When the fuse opens, the circuit is
  disconnected from the power source.

Fuse
Generator
4
Unit 6 Series Circuits

• In a series circuit, the sum of all the voltage
  drops across all the resistors must equal the
  source voltage.

5
Unit 6 Series Circuits

• The series circuit shows four resistors having
  different voltage drops. Again, the sum of the
  voltage drops equals the applied source voltage
  in a series circuit.

6
Unit 6 Series Circuits

• Rules for Calculating Series Circuit Values
• The current is the same at any point in the
  circuit.
• The total resistance is the sum of the individual
  resistors.
• The applied voltage is equal to the sum of the
  voltage drops across all the resistors.

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Unit 6 Series Circuits

• Formulas for Calculating Series Circuit Values
• ITOTAL I1 I2 I3 INUMBER OF RESISTORS
• RTOTAL R1 R2 R3 .. RNUMBER OF RESISTORS
• ETOTAL E1 E2 E3 .. ENUMBER OF RESISTORS

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Unit 6 Series Circuits

• Example of Series Circuit Values
• ITOTAL I1 I2 I3 2 A
• RTOTAL 20 ? 10 ? 30 ? 60 ?
• ETOTAL 40 V 20 V 60 V 120 V

Please insert figure 6-6
9
Unit 6 Series Circuits

• Power in a Series Circuit
• The total power used in a circuit is equal to the
  sum of the power used by all parts.
• PTOTAL P1 P2 P3 PNUMBER OF RESISTORS

Please insert Figure 6-21
10
Unit 6 Series Circuits

• The voltage divider circuits are used to provide
  different voltages between specific points.

11
Unit 6 Series Circuits

• Review
• Series circuits have only one path for current
  flow.
• The individual voltage drops in a series circuit
  can be added to equal the applied voltage.
• The current is the same at any point in a series
  circuit.

12
Unit 6 Series Circuits

• Review
• The individual resistors can be added to equal
  the total resistance of the circuit.
• Fuses and circuit breakers are connected in
  series with the devices they are intended to
  protect.

13
Unit 6 Series Circuits

• Review
• The total power in any circuit is equal to the
  sum of the power dissipated by all parts of the
  circuit.
• When the source voltage and total resistance are
  known, the voltage drop across each element can
  be computed using the general voltage divider
  formula.