Stella Academy

electronics Module

Interactive Simulation Screen

SYS_OK

Lesson Directive // Circuit Flow (Current)REF_CORE

The Driving Force

I

=

V

R

Hover over a variable in the formula above, or see glossary below:

I

Current

Amperes (A)

V

Voltage

Volts (V)

R

Resistance

Ohms (Ω)

Voltage is the push that causes electrons to move. A battery provides this potential difference across a closed circuit.

INSIGHT: Without voltage, there is no current.

Resistance Limits Flow

Every component and wire has some resistance. Resistors are used specifically to limit current to safe levels for sensitive components like LEDs.

INSIGHT: Higher resistance means less current flows for a given voltage.

Ohm's Law

Current is directly proportional to voltage and inversely proportional to resistance. This fundamental relationship governs all basic electrical circuits.

INSIGHT: I = V / R

●Telemetry Control Console

CAL_SYS

Adjust Simulator Parameters

Resistor Value:150 Ω

Syllabus Worked Example

Q: Determine current (I) in a 12V loop with a 150 \Omega resistor.

1.Apply Ohm's Law: I = \frac{V}{R}.

2.Substitute values: I = \frac{12}{150}.

3.Calculate the result in Amperes.

Result:I = 0.08 \text{ A (80 mA)}