Resistor

An ideal resistor between two electrical pins.

  • electrical
  • Gradara equations
  • 2 ports
  • 1 parameter
BlockResistorKindresistorLibraryElectrical

Description

An ideal linear resistor between its two pins: the voltage across it is proportional to the current through it (Ohm’s law).

Example

RC and RL transients A 10 V step charges a capacitor through a resistor, and another builds current in an inductor through a conductor.

Step 10 VR 1 kΩC 100 µFCapacitor voltageGroundStep 10 V (RL)G 0.1 SInductor currentL 1 HGround (RL)
In Gradara, select a Resistor block and press F1, then choose Open example. It opens as a new model in My models, ready to run.

Also in this example:Voltage sensorCurrent sensorGroundCapacitorInductorConductorStep voltage

Ports

Conserving terminals 2

  • +pelectrical

    Positive pin. Current into p is counted as positive.

  • −nelectrical

    Negative pin.

Parameters

  • ResistanceR1 Ω

    ≥ 0.000001

    Resistance, in ohms. At least 1 µΩ.

Equations

Modelica
v = p.v − n.v
i = p.i, p.i + n.i = 0
v = R · i

Assumptions and limitations

  • No temperature dependence, noise, or inductance. For heating, use Resistor (thermal).

Used in

These larger examples use it too. Open them from Examples in the app.

  • Buck converter · Ideal switches
  • 480 VAC → 24 VDC flyback

See also

Select a block in Gradara and press F1 to open its page offline.