Resistor
A resistor limits current and creates voltage drops. Ohm's law says voltage equals current multiplied by resistance.
Working Principle
A resistor limits current and creates voltage drops. Ohm's law says voltage equals current multiplied by resistance.
Step by Step
- Higher resistance means less current.
- Resistors protect LEDs and sensor inputs.
- Series resistors add together.
- Parallel resistors lower total resistance.
Working Simulation
Verified Learning Notes
Ohm law is V = I x R. More resistance gives less current for the same voltage.
Resistors protect LEDs, make pull-up/pull-down inputs, and create voltage dividers for signal-level safety.
Choose resistor power rating when current is high. Small signal resistors are not for motor power.
Calculate LED current with 5V, 2V LED drop, and 220 ohm resistor: about 13.6 mA.
Simulation Challenge
Use the working simulation above before touching wires. Change one value or command at a time, predict the result, then compare it with the diagram and the real module.
- Say what input changed.
- Predict the output.
- Run the simulator.
- Explain why the result is correct for Resistor.
Authenticity Checklist
- Does the diagram match Arduino Nano pin names?
- Does every signal have a common ground reference?
- Is the module powered at its correct voltage?
- Does the explanation separate signal, data, power, and mechanical motion?