Ohm's law
Current equals voltage divided by resistance for this resistor model. Level: standard.
Learning goals
- Read V = I R as a relation among three quantities.
- See current rise when voltage rises and resistance stays fixed.
- Compute current for a stated voltage and resistance.
Simulation
Resistance is fixed. This is not a model of a heating filament.
Formulas
- Ohm. V = I R
- Current. I = V / R
Worked example: at 12 volts and resistance 4, current is 3.
Quiz
Answers
- If voltage is 12 and resistance is 4, current is what? Answer: 3.
- If voltage doubles and resistance stays the same, current does what? Answer: Doubles.
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