Students define current, voltage and resistance with their units and measuring instruments, then use Ohm's law (V = IR) to calculate voltage, current and resistance, including converting milliamps to amps. They compare series and parallel circuits, calculating current, voltage and total resistance in each, analyze a table of results to find a resistance and explain why household circuits are wired in parallel.
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Curriculum: Texas grade levels (TEKS). We show specific outcome codes only where they have been verified against the official curriculum document.
Completed: Electricity: Current, Voltage, Resistance and Ohm's Law
9th Grade students (typically ages 14–15) working on energy, light, sound & electricity. It is pitched at level 3 · challenge; an easier version is linked above.
Yes. The PDF includes a full answer sheet with model answers and success criteria where there is more than one good answer. You can also view the answers online.
About 45 minutes for 19 questions. Short, regular sessions work best: two or three a week beats one long one.
No. Click Download Free PDF and it opens immediately. It is free for personal, classroom and homeschool use.
Try Light: Reflection, Refraction and the Electromagnetic Spectrum.
Success TutoringWorksheets9th Grade · Science · Energy, Light, Sound & ElectricityName
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V = IR. Show the formula, your substitution and the unit in every calculation. Practical work uses low-voltage supplies only, under teacher supervision.
Current (I) is the rate of flow of electric charge around a circuit, measured in amperes (A, or amps). 1 A = 1000 milliamps (mA).
Voltage (V), also called potential difference, is the energy given to or used by each unit of charge, measured in volts (V). The battery provides the voltage that pushes the current.
Resistance (R) is how much a component opposes the flow of current, measured in ohms. (Its symbol is the Greek capital letter omega; this worksheet writes the unit as ohms.)
Ohm's law: for a resistor at constant temperature, V = IR. Rearranged: I = V ÷ R and R = V ÷ I.
Write the formula, substitute with units, and give your answer with the correct unit.
Series circuit (one loop): the current is the same through every component; the voltages across the components add up to the supply voltage; total resistance = sum of the resistances.
Parallel circuit (two or more branches): each branch has the full supply voltage across it; the branch currents add up to the total current from the supply; the total resistance is less than the smallest branch resistance.
Preview — the PDF contains the full resource and answer sheet.
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Worksheet · 8th Grade · Energy, Light, Sound & Electricity · Level 2 · Standard
Worksheet · 8th Grade · Energy, Light, Sound & Electricity · Level 2 · Standard
Worksheet · 10th Grade · Energy, Light, Sound & Electricity · Level 3 · Challenge
Worksheet · 10th Grade · Energy, Light, Sound & Electricity · Level 3 · Challenge
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