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Questions and Answers
In a series circuit, how is the total voltage calculated?
In a series circuit, how is the total voltage calculated?
- It is the sum of the voltages across each load. (correct)
- It is the average of all voltages.
- It is the minimum voltage among the loads.
- It is the product of the voltages.
In a parallel circuit, the voltage across each load is different.
In a parallel circuit, the voltage across each load is different.
False (B)
What happens to the current in a parallel circuit as more devices are added?
What happens to the current in a parallel circuit as more devices are added?
The total current increases.
In series circuits, increasing the voltage will cause the bulbs to burn __________.
In series circuits, increasing the voltage will cause the bulbs to burn __________.
Match the following circuit components with their functions:
Match the following circuit components with their functions:
What is a disadvantage of a series circuit?
What is a disadvantage of a series circuit?
Adding more loads in a parallel circuit decreases the total current.
Adding more loads in a parallel circuit decreases the total current.
What issue can arise from increased current in a parallel circuit?
What issue can arise from increased current in a parallel circuit?
The equation for total current in a parallel circuit is __________.
The equation for total current in a parallel circuit is __________.
What is the function of a resistor in a circuit?
What is the function of a resistor in a circuit?
What happens to the total resistance in a series circuit as additional loads are added?
What happens to the total resistance in a series circuit as additional loads are added?
In a parallel circuit, a break in one pathway affects the other pathways.
In a parallel circuit, a break in one pathway affects the other pathways.
What is the primary characteristic of a series circuit?
What is the primary characteristic of a series circuit?
In a parallel circuit, total resistance ______ as loads are added.
In a parallel circuit, total resistance ______ as loads are added.
Match the following circuit types with their characteristics:
Match the following circuit types with their characteristics:
What remains the same throughout a series circuit?
What remains the same throughout a series circuit?
What is the effect of adding an extra lane in a parallel circuit during rush hour?
What is the effect of adding an extra lane in a parallel circuit during rush hour?
Fuses are typically wired in parallel to control the entire circuit.
Fuses are typically wired in parallel to control the entire circuit.
The ______ provides the energy/force needed to supply all of the loads in a series circuit.
The ______ provides the energy/force needed to supply all of the loads in a series circuit.
Describe the effect of adding more loads in a series circuit.
Describe the effect of adding more loads in a series circuit.
Flashcards
Series Circuit
Series Circuit
A circuit where electrons flow along a single path.
Parallel Circuit
Parallel Circuit
A circuit with multiple pathways for electrons to flow.
Resistance in a Series Circuit
Resistance in a Series Circuit
The total resistance in a series circuit increases as more loads are added.
Resistance in a Parallel Circuit
Resistance in a Parallel Circuit
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Current in a Series Circuit
Current in a Series Circuit
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Voltage in a Series Circuit
Voltage in a Series Circuit
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Voltage in a Parallel Circuit
Voltage in a Parallel Circuit
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Current in a Parallel Circuit
Current in a Parallel Circuit
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Switch
Switch
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Fuse
Fuse
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Total Voltage (Series)
Total Voltage (Series)
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Current (Series)
Current (Series)
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Total Current (Parallel)
Total Current (Parallel)
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Voltage (Parallel)
Voltage (Parallel)
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Series Circuit Disadvantage
Series Circuit Disadvantage
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Parallel Circuit Disadvantage
Parallel Circuit Disadvantage
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Fuses and Circuit Breakers
Fuses and Circuit Breakers
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Circuit Breaker
Circuit Breaker
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Blown Fuse or Tripped Breaker
Blown Fuse or Tripped Breaker
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Study Notes
Grade 9 Science, Academic - Lesson 11.2 - Voltage and Current in Series and Parallel Circuits
- Learning Goals: Understand how electrical circuits are designed using series and parallel configurations.
- Success Criteria:
- Explain the difference between series and parallel circuits.
- Use circuit symbols to draw circuit diagrams.
- Explain how voltage (V), current (I), and resistance (R) are affected by the number of loads in a circuit.
- Recap: Review of potential difference, current, and resistance.
- Note Format: First series circuits, then parallel, to aid comparing/contrasting.
- Series Circuits:
- One path for electron flow.
- If one part of the circuit is open, electron flow stops.
- Total resistance increases as loads are added (equivalent to adding more hurdles).
- Parallel Circuits:
- Electrons can flow through multiple paths.
- A break in one path doesn't affect the others.
- Total resistance decreases as loads are added (like adding extra lanes to prevent traffic congestion).
- Combination Circuits:
- Some circuits use both series and parallel components.
- Switches and fuses are often wired in series to control/protect the entire circuit.
- Circuit Symbols:
- Diagrams showing fuses, circuit breakers, switches etc.
- Practice Problems:
- Draw a circuit with a 2-cell battery, resistor and light bulb in series. Show correct polarity and electron flow.
- Draw a circuit with a 4.5 volt battery, two bulbs and a resistor in parallel, also including a fuse.
- Series Circuit Current:
- Current is the same throughout the entire circuit.
- Total current = current through every part of the circuit.
- Series Circuit Voltage:
- Voltage is the sum of the voltage across each load.
- Total voltage = the sum of the voltages across each component.
- Parallel Circuit Current:
- Current is shared throughout the circuit and is equal to the sum of individual branch current.
- Total current = sum of the currents through all branches.
- Parallel Circuit Voltage:
- Voltage is the same across each branch. All components use the same total supplied voltage.
- Voltage and Current Relationships
- Series Circuits: Disadvantages—If one component fails, the entire circuit is interrupted.
- Parallel Circuits: Disadvantages—Adding more loads increases the current, risking overheating wires and causing a fire.
- Safety devices (fuses/circuit breakers) are used to prevent these problems in home circuits. Their purpose is to interrupt the circuit if a high current is detected.
- Practice: Circuit Analysis: Solve problems involving missing values in series or parallel circuits.
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