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PEAZIT Aha card

Current: what changes when resistance grows?

At the same voltage, greater resistance means less current: I = V/R.

Voltage stays at 6 V.

Voltage	Resistance	Current
6 V	3 Ω	2 A
6 V	6 Ω	1 A

One worked example

I = V/RDivide voltage by resistance to get current.
I = 6/3 = 2 AAt 6 V and 3 Ω, current is 2 A.

Watch out: Assume an ohmic resistor at constant temperature. Not every component has constant resistance. Do not experiment with mains electricity.

Goal, prerequisites and card origin

What you will learn: Apply Ohm’s law to an ohmic resistor.

What you need first: Voltage V in volts, current I in amperes, resistance R in ohms.

An original PEAZIT working card. Independent expert review and effectiveness testing have not yet taken place. · v1

Show connections

Circuit: voltage, current and resistance

Voltage source U — creates a potential difference — Closed circuit

Closed circuit — allows sustained current — Current I

Resistance R — at the same U, larger R reduces I — Current I

Voltage source U — voltage enters the relation — I = U/R

Resistance R — for an ohmic element under unchanged conditions — I = U/R

At the same voltage, greater resistance means less current: I = V/R.

Without JavaScript, write your answer elsewhere before opening the solution.A resistor has resistance 4 Ω and voltage 12 V across it. How many amperes flow?