Transcript Unit 06 Series

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.
Unit 6 Series Circuits
A series circuit has only one path for current flow.
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
Unit 6 Series Circuits
In a series circuit, the sum of all the voltage drops
across all the resistors must equal the source
voltage.
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.
Unit 6 Series Circuits
Rules for Calculating Series Circuit Values
1. The current is the same at any point in the circuit.
2. The total resistance is the sum of the individual
resistors.
3. The applied voltage is equal to the sum of the
voltage drops across all the resistors.
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
Unit 6 Series Circuits
Example of Series Circuit Values
ITOTAL = I1 = I2 = I3 = 2 A
RTOTAL = 20 Ω + 10 Ω + 30 Ω = 60 Ω
ETOTAL = 40 V + 20 V + 60 V = 120 V
Please insert figure 6-6
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
Unit 6 Series Circuits
The voltage divider
circuits are used to
provide different
voltages between
specific points.
Unit 6 Series Circuits
Review:
1. Series circuits have only one path for
current flow.
2. The individual voltage drops in a series
circuit can be added to equal the applied
voltage.
3. The current is the same at any point in a
series circuit.
Unit 6 Series Circuits
Review:
4. The individual resistors can be added to
equal the total resistance of the circuit.
5. Fuses and circuit breakers are connected in
series with the devices they are intended to
protect.
Unit 6 Series Circuits
Review:
6. The total power in any circuit is equal to the
sum of the power dissipated by all parts of
the circuit.
7. When the source voltage and total
resistance are known, the voltage drop
across each element can be computed
using the general voltage divider formula.