REFSTUDY GUIDE: Big IdeasUse to answer form questions
1.Ohm's Law: Electric current flows through a closed circuit — a complete loop from a power source through components and back. Voltage (measured in Volts) is the "push" that drives current, and resistance (measured in Ohms) opposes it. Ohm's Law (V = I × R) predicts that increasing voltage increases current, while increasing resistance decreases it.
2.Power & Overload: Electrical power (P = V × I, measured in Watts) tells you the rate of energy transfer. A 1,500W hairdryer converts electrical energy to heat and motion much faster than a 60W light bulb. When multiple high-power devices share a circuit, total current draw can exceed the wiring's capacity — this is an overload, which trips circuit breakers to prevent fires.
3.Series vs. Parallel: In a series circuit, components share a single path — if one breaks, all stop working (like old holiday lights). In a parallel circuit, each component has its own path — if one breaks, the others continue. Home wiring uses parallel circuits so you can turn off one device without losing everything, but this means adding devices increases total current draw on the shared supply wire.
DRAWKEY TERMSGoogle each → Images tab → sketch what you see
voltage
Electrical pressure that pushes charge through a circuit (measured in Volts)
resistance
Opposition to current flow in a circuit (measured in Ohms)
power
Rate of energy transfer (P = V × I, measured in Watts)
overload
When a circuit draws more current than it can safely handle
OTHER VOCAB: circuit · series circuit · parallel circuit · current · Ohm's Law · circuit breaker · Watt
WRITEFOCUS QUESTIONYour initial thinking
You're blow-drying your hair in the bathroom when someone turns on a space heater in the next room. Suddenly the lights flicker and dim. Both devices are plugged into different outlets — so why does turning on the heater affect the lights? The answer lies in how circuits share electrical supply.
Why do the lights dim when you turn on a hairdryer?
I think...TODO: author answer text
WRITEAFTER HOOK FORMReflect before continuing
I learned that...TODO: author answer text
Station 1 — Ohm's Law Investigation
I observed that...TODO: author answer text
This shows that...TODO: author answer text
The key concept is...TODO: author answer text
CHECKDAY 1 CHECK-INBefore you leave
Q1:Based on today's investigation of electric circuits & power,
explain one key finding using evidence from your data. Connect your
answer to this week's focus question: Why do the lights dim when you
turn on a hairdryer?
TODO: author answer text
Confidence:
Electric Circuits & Power (Day 2)ANSWER KEY
Name: Period:
Station 2 — Power & Energy Analysis
Main idea I observed:
Evidence from my data:
I can apply this by:
Station 2 — Power & Energy Analysis
The data shows...TODO: author answer text
This connects to what we learned because...TODO: author answer text
I can conclude that...
Station 3 — Eng. Design
The main idea is...TODO: author answer text
This connects to what we learned because...TODO: author answer text
I can apply this by...TODO: author answer text
DRAWCONCEPT MODELShow your understanding visually
Draw a model that shows the main concept. Include labels and arrows
to explain relationships.
TODO: author answer text
Labels included
Relationships shown
Key terms used
CHECKTEST YOUR THINKINGRate each: FALSE ← 1–2–3–4–5 → TRUE
1. Adding more devices to a circuit gives each device more power because the circuit "tries harder."
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2. Current is "used up" as it flows through a resistor, so less current exits than enters.
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3. A device rated at higher watts always draws higher voltage from the outlet.
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4. In a home circuit, if one outlet stops working, all the lights in the house should go out.
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5. A circuit breaker trips because too much voltage is flowing — turning off some lights will fix the overload.
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Pick any TWO statements — especially any you rated 2, 3, or 4. Justify your rating with evidence:
Statement #___ — I rated it ___ because:
Statement #___ — I rated it ___ because:
THINKSCIENTIST CIRCLE DEBRIEFReflect after class discussion
AHA! Moment
The one I changed my thinking most about is...TODO: author answer text
Remaining Question
I still wonder...TODO: author answer text
WRITEFOCUS QUESTION REVISITFinal written response
Why do the lights dim when you turn on a hairdryer?