Series vs parallel circuits

CONCEPTUAL

Science›Energy|Ages 12—13|ID: mt_loEMaQ8kFA

Describe and apply the rules for current, voltage, and resistance in series and parallel circuits, and explain the practical uses of each circuit type

Mastery Evidence

States the rules for current and voltage in series circuits (current same everywhere; voltages add up)
States the rules for current and voltage in parallel circuits (voltages same across each branch; currents add up)
Explains why household wiring uses parallel circuits and identifies the advantage of each type

Assessment Prompt

“Can [child] explain why the lights in your home don't all switch off when you turn off one room's light, but a string of old-fashioned Christmas lights does go off if one bulb breaks?”

Curriculum Standards1 alignment

MS-PS2-3Next Generation Science Standards (NGSS) Middle Schoolcodes only

Standard code — full text not included in this dataset.

Prerequisites3

Ohm's Law: voltage, current, resistance
hardAges 12—13
Circuit vocabulary
hardAges 9—11
Why circuit components behave differently
softAges 10—11

Show full prerequisite tree

Ohm's Law: voltage, current, resistance hard
Applying V = IR rules to series and parallel circuits requires Ohm's Law as a working tool
- Current, voltage, and what they measure hard
  Ohm's Law relates voltage (V), current (I) and resistance (R) — requires prior understanding of what each quantity means
  - Circuit vocabulary hard
    Understanding current as charge flow and voltage as energy per charge requires these exact technical terms
  - Drawing circuits with proper symbols hard
    Understanding current and voltage as quantities requires the ability to read circuit diagrams with standard symbols, established at KS2
    - Why circuit components behave differently soft
      Understanding component variations supports interpreting and drawing circuit diagrams
      - Circuit vocabulary hard
        Comparing circuit component function requires component vocabulary: bulb, buzzer, switch, resistance
      - More batteries, brighter bulb hard
        Must understand voltage-brightness relationship before comparing component variations
        
        How switches work hard
        Must understand switches and circuits before investigating voltage effects
        
        Will the bulb light up? hard
        Must understand complete loops before understanding how switches open/close them
        
        Building a simple circuit hard
        Must build circuits before predicting whether a lamp will light
        
        What uses electricity at home hard
        Must identify electrical appliances before building circuits
        
        Circuit vocabulary hard
        Associating brightness with voltage requires 'voltage', 'current', and 'series circuit' vocabulary
        
        How energy travels around soft
        Energy transfer concept supports understanding voltage as energy per charge
        
        Light & Seeing in the Dark soft
        Light knowledge supports understanding energy transfer by light
        
        Light & Sound Vocabulary hard
        Observing that objects need illumination to be seen requires the 'light source' vocabulary
        
        Naming types of energy hard
        Describing energy transfer by sound, light, heat, and electric current requires energy type vocabulary
        
        Building a simple circuit hard
        Must know circuits before understanding energy transfer by electric current
        
        What uses electricity at home hard
        Must identify electrical appliances before building circuits
        
        Vibrations & Sound soft
        Sound knowledge supports understanding energy transfer by sound
        
        Light & Sound Vocabulary hard
        Understanding vibrating materials and sound requires 'vibration' vocabulary
        
        Communication with Light & Sound hard
        Must understand how sound works before designing a communication device using it
        
        Light & Seeing in the Dark hard
        Must understand how light works before designing a communication device using it
        
        Light & Sound Vocabulary hard
        Observing that objects need illumination to be seen requires the 'light source' vocabulary
    - More batteries, brighter bulb hard
      Must understand circuit behaviour before representing circuits with formal symbols
      - How switches work hard
        Must understand switches and circuits before investigating voltage effects
        
        Will the bulb light up? hard
        Must understand complete loops before understanding how switches open/close them
        
        Building a simple circuit hard
        Must build circuits before predicting whether a lamp will light
        
        What uses electricity at home hard
        Must identify electrical appliances before building circuits
      - Circuit vocabulary hard
        Associating brightness with voltage requires 'voltage', 'current', and 'series circuit' vocabulary
      - How energy travels around soft
        Energy transfer concept supports understanding voltage as energy per charge
        
        Light & Seeing in the Dark soft
        Light knowledge supports understanding energy transfer by light
        
        Light & Sound Vocabulary hard
        Observing that objects need illumination to be seen requires the 'light source' vocabulary
        
        Naming types of energy hard
        Describing energy transfer by sound, light, heat, and electric current requires energy type vocabulary
        
        Building a simple circuit hard
        Must know circuits before understanding energy transfer by electric current
        
        What uses electricity at home hard
        Must identify electrical appliances before building circuits
        
        Vibrations & Sound soft
        Sound knowledge supports understanding energy transfer by sound
        
        Light & Sound Vocabulary hard
        Understanding vibrating materials and sound requires 'vibration' vocabulary
        
        Communication with Light & Sound hard
        Must understand how sound works before designing a communication device using it
        
        Light & Seeing in the Dark hard
        Must understand how light works before designing a communication device using it
        
        Light & Sound Vocabulary hard
        Observing that objects need illumination to be seen requires the 'light source' vocabulary
  - More batteries, brighter bulb hard
    KS2 observation that more cells gives brighter bulbs is the empirical foundation for defining voltage as energy per charge
    - How switches work hard
      Must understand switches and circuits before investigating voltage effects
      - Will the bulb light up? hard
        Must understand complete loops before understanding how switches open/close them
        
        Building a simple circuit hard
        Must build circuits before predicting whether a lamp will light
        
        What uses electricity at home hard
        Must identify electrical appliances before building circuits
    - Circuit vocabulary hard
      Associating brightness with voltage requires 'voltage', 'current', and 'series circuit' vocabulary
    - How energy travels around soft
      Energy transfer concept supports understanding voltage as energy per charge
      - Light & Seeing in the Dark soft
        Light knowledge supports understanding energy transfer by light
        
        Light & Sound Vocabulary hard
        Observing that objects need illumination to be seen requires the 'light source' vocabulary
      - Naming types of energy hard
        Describing energy transfer by sound, light, heat, and electric current requires energy type vocabulary
      - Building a simple circuit hard
        Must know circuits before understanding energy transfer by electric current
        
        What uses electricity at home hard
        Must identify electrical appliances before building circuits
      - Vibrations & Sound soft
        Sound knowledge supports understanding energy transfer by sound
        
        Light & Sound Vocabulary hard
        Understanding vibrating materials and sound requires 'vibration' vocabulary
        
        Communication with Light & Sound hard
        Must understand how sound works before designing a communication device using it
        
        Light & Seeing in the Dark hard
        Must understand how light works before designing a communication device using it
        
        Light & Sound Vocabulary hard
        Observing that objects need illumination to be seen requires the 'light source' vocabulary
Circuit vocabulary hard
Applying rules for current, voltage, and resistance in series and parallel circuits requires all this vocabulary
Why circuit components behave differently soft
KS2 investigation of component variations (brightness/loudness) provides intuitive grounding for series vs parallel behaviour
- Circuit vocabulary hard
  Comparing circuit component function requires component vocabulary: bulb, buzzer, switch, resistance
- More batteries, brighter bulb hard
  Must understand voltage-brightness relationship before comparing component variations
  - How switches work hard
    Must understand switches and circuits before investigating voltage effects
    - Will the bulb light up? hard
      Must understand complete loops before understanding how switches open/close them
      - Building a simple circuit hard
        Must build circuits before predicting whether a lamp will light
        
        What uses electricity at home hard
        Must identify electrical appliances before building circuits
  - Circuit vocabulary hard
    Associating brightness with voltage requires 'voltage', 'current', and 'series circuit' vocabulary
  - How energy travels around soft
    Energy transfer concept supports understanding voltage as energy per charge
    - Light & Seeing in the Dark soft
      Light knowledge supports understanding energy transfer by light
      - Light & Sound Vocabulary hard
        Observing that objects need illumination to be seen requires the 'light source' vocabulary
    - Naming types of energy hard
      Describing energy transfer by sound, light, heat, and electric current requires energy type vocabulary
    - Building a simple circuit hard
      Must know circuits before understanding energy transfer by electric current
      - What uses electricity at home hard
        Must identify electrical appliances before building circuits
    - Vibrations & Sound soft
      Sound knowledge supports understanding energy transfer by sound
      - Light & Sound Vocabulary hard
        Understanding vibrating materials and sound requires 'vibration' vocabulary
      - Communication with Light & Sound hard
        Must understand how sound works before designing a communication device using it
        
        Light & Seeing in the Dark hard
        Must understand how light works before designing a communication device using it
        
        Light & Sound Vocabulary hard
        Observing that objects need illumination to be seen requires the 'light source' vocabulary

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