13 December 2021 Series vs Parallel Circuits LO

13 December 2021 Series vs. Parallel Circuits LO: Learn how we decide between a series or parallel circuit for different purposes Starter: Quick Quiz – Have your mini-white boards ready Current is measured in amps TRUE

TRUE or FALSE Current is measured in amps TRUE

TRUE or FALSE Current is the same in a series circuit? TRUE

QUESTION The particle that produces a current is called… A. Electron B. Neutron C. Electrode

TRUE or FALSE The symbol for an ammeter is… FALSE

QUESTION What current does the middle ammeter show if the battery gives out 5 Amps A. 1 Amp B. 5 Amps C 2. 5 Amps

Series vs. Parallel Circuits Low Mid High • Know how to draw parallel circuits • Explain how current changes in a parallel circuit • Evaluate a model to compare the differences between series and parallel circuits • Explain how current depends on the path of least resistance GCSE Keywords – Resistance, ohms, voltage, current, energy, metal ions, electrons

Series vs. Parallel PARALLEL SERIES Same number of bulbs and batteries, but what is the difference? Think – pair – share

Series vs. Parallel circuits Current is the flow of electrons Current is the same across the bulbs Why is it different? Current is different across bulbs

Parallel circuit models Low Mid High Start at your target and progress onwards. Extension: Design your own model of a parallel circuit and explain how it works GCSE • Know how to draw parallel circuits • Explain how current changes in a parallel circuit • Evaluate a model to compare the differences between series and parallel circuits • Explain how current depends on the path of least resistance Keywords – Resistance, ohms, voltage, current, energy, metal ions, electrons

Current and voltage in parallel circuits Low • Identify the current values in a parallel circuit Mid • Identify the values for current in a mix of parallel and series circuits High • Evaluate a complex parallel circuit to determine the values for current • Synthesise a complex diagram and produce values that correctly show current splits GCSE Keywords – Resistance, ohms, voltage, current, energy, metal ions, electrons

Current and Voltage in Parallel 12 V; 6 A 12 V 6 A 3 A 12 V A Current splits equally at the junction 12 V 3 A Each electron has 12 V! B Current joins back together

Current 8 Amps Current splits ? Amps Current joins

However for voltage… 20 Volts ? Volts They are all 20 V! ? Volts Each bulb has the same brightness

Resistance vs. Length Summary: In a parallel circuit: ü Current splits at each junction ü Voltage stays the same Quick check If…A 2 = 3 A and A 4 = 9 A A 1 = _A and A 3 = _A

Activity 2 – Current in parallel ü Complete the low/mid section ü Complete the mid/high section ü Complete the high/GCSE section ü Design your own circuit diagram Low • Identify the current values in a parallel circuit Mid • Identify the values for current in a mix of parallel and series circuits High • Evaluate a complex parallel circuit to determine the values for current GCSE • Synthesise a complex diagram and produce values that correctly show current splits Keywords – Resistance, ohms, voltage, current, energy, metal ions, electrons

Plenary Jack and Jill have two separate bedrooms. Each person wants a ceiling bulb with a wall switch. Both bulbs require the same voltage to work (the current doesn’t matter) Draw a circuit diagram that shows how the two bedrooms should be wired.

Current and voltage in parallel circuits Low Mid • Identify the current values in a parallel circuit • Identify the values for current in a mix of parallel and series circuits • Evaluate a complex parallel circuit to determine the values for current High • Synthesise a complex diagram and produce GCSE values that correctly show current splits Keywords – Resistance, ohms, voltage, current, energy, metal ions, electrons