What resistance means
Resistance is opposition to current flow. A resistor makes it harder for electric charge to move through the path.
Current & Voltage Course
Lesson 4 of 16: What is Resistance
Move step by step through the course and keep track of where you are.
Simulation
What is Resistance?
Resistance is the opposition to current flow. It controls how easily electric charge can move through a circuit.
Voltage
12.0 V
Resistance
6.0 Ohm
Current
2.00 A
Core idea
More resistance means less current flow. Less resistance means current can move more easily through the circuit.
Simple idea
More resistance means more opposition. If voltage stays the same, that stronger opposition usually reduces current.
Resistance View
Watch resistance control the flow
In this lesson, resistance is the opposition inside the path. As you raise resistance, charge has a harder time moving. As you lower it, the path becomes easier for current to use.
Resistance level
MEDIUM
This shows how hard the circuit is pushing back against charge movement.
Formula
I = V / R
12.0 / 6.0 = 2.00 A
Circuit effect
Easy Flow
The resistor protects the circuit by limiting how much current can move.
What to notice
When voltage stays the same, increasing resistance makes current smaller. Lower resistance gives charge an easier path, so current rises more easily.
Beginner Summary
Keep these resistance ideas in mind
This lesson becomes easier when you remember one picture: resistance is like a narrow part of the path that makes movement harder.
Resistance slows the movement of charge. Low resistance allows easier flow. High resistance limits current and helps protect the circuit.
Low resistance
When resistance is low, current can move more easily. The LED receives more energy and the circuit becomes more active.
High resistance
When resistance is high, current becomes smaller. This helps protect components and control the circuit safely.