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🔌 Electricity & Circuits

Trace how voltage, current, and resistance shape every circuit you touch.

3
lessons
~30 min
to learn
🔬 Science
subject
Teens
level
Start the course →

What you’ll learn

  1. Define current, voltage, resistance, and the parts of a complete circuit.Current is the flow of charge, voltage is the pressure that pushes it, and resistance opposes it. A working circuit needs a source, conductors, and a load arranged in an unbroken loop.
  2. Apply Ohm's law and distinguish series from parallel circuits.Ohm's law (V = I x R) links voltage, current, and resistance. Series circuits share one path with equal current, while parallel circuits offer multiple paths with equal voltage. A multimeter measures all three quantities.
  3. Calculate electrical power, compare AC and DC, and identify safety devices.Power equals voltage times current. DC flows one way while AC reverses to enable long-distance transmission. Fuses, breakers, and grounding keep circuits and people safe, and these principles appear in devices everywhere.

Questions this course answers

What is electric current a measure of?

Current is the flow of electric charge, measured in amperes, and requires a continuous path to flow.

Voltage is best described as the electrical:

Voltage is the potential difference that pushes charges through a circuit, measured in volts.

What does a switch do when turned off?

A switch breaks the circuit's closed loop, stopping the flow of current.

Ohm's law states that voltage equals:

Ohm's law is V = I x R, so voltage equals current multiplied by resistance.

In a series circuit, the current through each component is:

A series circuit has one single path, so the same current flows through every component.

Why is your home wired in parallel?

In parallel, each branch is independent, so one burned-out bulb does not darken the rest.

Grounded in trusted sources

  • Georg Ohm, Die galvanische Kette, mathematisch bearbeitet (1827)
  • All About Circuits, Series and Parallel Circuits Textbook (allaboutcircuits.com/textbook/direct-current/chpt-5/)
  • DigiKey, How to Apply Ohm's Law to Series and Parallel Circuits (digikey.com)
  • The Physics Classroom, Electric Circuits Unit (physicsclassroom.com)
  • Britannica, Electricity (britannica.com/science/electricity)

Every Wunder lesson is built from real, reputable sources — never invented.

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