PEAZIT Aha card
Go straight to resources ↓Voltage, current and resistance answer different questions
Voltage is a difference in electric potential between two points. Current is charge passing per time. Resistance describes how a component opposes current.
| Quantity | Unit | Question |
|---|---|---|
| Voltage U | volt (V) | What is the potential difference? |
| Current I | ampere (A) | How much charge passes per time? |
| Resistance R | ohm (Ω) | How does the component oppose current? |
One worked example
- U = 6 V; R = 3 ΩConsider an ohmic resistor at constant temperature.
- I = U ÷ R = 6 ÷ 3Higher resistance gives less current at the same voltage.
- I = 2 AAn ampere is a unit of current.
Watch out: A resistor does not “use up” current; energy is converted. This example is not an instruction for experimenting with mains electricity.
Goal, prerequisites and card origin
What you will learn: Distinguish voltage, current and resistance in a simple circuit.
What you need first: Meaning of an electric circuit and division.
An original PEAZIT working card. Independent expert review and effectiveness testing have not yet taken place. · v1
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Voltage is a difference in electric potential between two points. Current is charge passing per time. Resistance describes how a component opposes current.