Series and Parallel Circuits

advertisement
Series and Parallel Circuits
Circuits
In order for electricity to flow we need
Power source
Closed circuit
There are two type of circuits we will
explore
Series circuit
Parallel circuit
Series Circuit
In a series circuit there is only one path for
the electrons to flow
In other words all the components are in
series with each other
Because there is only one path each
charge will go through each resistor
Predict, Test and Explain
• How will the brightness of the bulbs change
as we add more in series?
+
+
+
• What does this imply about the current in the
circuit?
Parallel Circuit
In a Parallel circuit there are multiple pathways for
charge to flow
Each device is placed on it’s own separate branch
Current goes through each of the branches at the same
time
Predict, Test and Explain
• How will the brightness of the bulbs change
as we add more in parallel?
+
+
+
• What does this imply about the current in the
circuit?
Key Concepts
Bulbs in series represent a source of
resistance to current flow, similar to
boulders in a stream which can block
the flow of water
Bulbs in parallel offer additional
pathways for current flow, similar to
branches of a stream which can carry
more water.
Calculating Resistance in Series
Circuits
The rule for
calculating Series
Circuits is to…
Add up the values of
each individual in the
series.
R1 + R2 + R3…
5 + 5 + 10
20 Ω (ohms)
Calculating Resistance in Series
Circuits
Add up the values of
each individual in the
series.
R1 + R2 + R3…
10 + 20 + 10
40 Ω (ohms)
10
20
Calculating Resistance in Series
Circuits
 The rule for calculating Series
Circuits is to…
 Add up the values of each
individual in the series.
 1 1
1
1
-- = -- + -- + - 1
Rt R1 R2 R3
-- = 1
 1 1 1 1
Rt
-- = -- + -- + -Rt 4 4 2
 1
-- = Rt
 1
1
-- = .25 + .25 + .5
Rt
 Rt = 1 Ω (ohms)
 1
-- = 1
Rt
 1
-- = 1
Rt
20
•
•
•
•
•
•
•
Calculating Resistance in Series
Circuits
The rule for calculating Series
Circuits is to…
Add up the values of each
individual in the series.
1 1
1
1
-- = -- + -- + -• 1
Rt R1 R2 R3
-- = Rt
1 1
1
1
.016
-- = -- + -+ -Rt 100 200 1000
• Rt = 62.5 Ω
(ohms)
1
-- = .01 + .005 + .001
Rt
1
-- = .016
Rt
1
-- = .016
Rt
100
200
1000
20
Download
Related flashcards

Digital electronics

21 cards

Handheld game consoles

47 cards

Power electronics

15 cards

Optoelectronics

14 cards

Microwave technology

17 cards

Create Flashcards