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Cobra4 Sensor-Unit Energy: Current, voltage, work, power

Cobra4 Sensor-Unit Energy: Current, voltage, work, power

Item no.: 12656-00

  • Description
  • Related Experiments
  • Downloads and Documents
  • Videos

Function and Applications

The Cobra4 Sensor-Unit Energy is used for the measurement and direct indication of measurement variables of the electrical power and energy in direct current and alternating current circuits (current, voltage, effective and apparent power, angular phase shift, frequency, electric work).


This sensor measures directly the values for alternating current and direct current. This allows numerous basic as well as application-oriented experiments, e.g. the determination of the charactersitics of alternating current resistances or the investigation of the energy demand of consumers.

Equipment and technical data

  • Operating modes:
    • "u(t), i(t)": instantaneous values, max. sample rate 2000 Hz
    • "Energy DC": direct current circuit, max. measuring rate 4 Hz
    • "Energy AC": alternating current circuit, max. measuring rate 4 Hz, up to 6000 Hz signal frequency, trueRMS
  • Voltage:
    • Range 30 V: -30…30 V, resolution: 0.01 V, internal resistance: > 5 MOhm
    • Range 1000 mV: -1000…1000 mV, resolution: 0.1 mV, internal resistance: > 200 kOhm
    • Accuracy: 1.5 % of upper range value
    • Damping: ±2 dB (at 6000 Hz)
    • Overvoltage protection: up to 50 V
  • Current:
    • Range 6 A: -6…6 A (6 A for 3 min until overcurrent protection is active), resolution: 0.001 A, internal resistance: 33 mOhm, overcurrent protection: max. 10 A self reset after approx. 5 min
    • Range 600 mA: -600…600 mA, resolution: 0.1 mA, internal resistance: 2 Ohm, overcurrent protection: max. 2 A self reset after approx. 5 min
    • Accuracy: 1.5 % of upper range value
    • Damping: ±2 dB (at 6000 Hz)
  • Active power: 0... max. 180 W, max. resolution 0.01 mW
  • Apparent power: 0... max. 180 VA, max. resolution 0.01 mVA
  • Reactive power: 0... max. 180 var, max. resolution 0.01 mvar
  • Electrical work: 0... max. 100000 Wh, max. resolution 0.1 Ws
  • Phase shift: -90…90°, resolution: 0.1°
  • Frequency: 10…6000 Hz, resolution: 0.1 Hz (< 1000 Hz), 1 Hz (> 1000 Hz)
  • Operating temperature range: 5…40° C
  • Relative humidity: < 80%
  • Current consumption: 100 mA
  • Dimensions L x W x H (mm): 110 x 70 x 30
  • Weight: 110 g

Necessary Accessories

  • Basic device:
    Cobra4 Wireless-Link 12601-00, and Wireless Manager 12600-00 and Software measure Cobra4 14550-61
    or Cobra4 USB-Link 12610-00 and Software measure Cobra4 14550-61
    or Cobra4 Mobile-Link 12620-10

Additional Accesories

  • Large scale display 07157-93 and Display-Connect Set 12623-88, for use with the Mobile-Link for demonstration experiments

Experiment Item no.
Photometric law of distance with Cobra4 - inverse square law P2240260
Heat capacity of gases with Cobra4 P2320261
Characteristic curves of semiconductors with Cobra4 P2410960
Determination of the enthalpy of vaporisation of liquids with Cobra4 P3020461
Determination of the mixing enthalpy of binary fluid mixtures with Cobra4 P3020661
Determination of the hydration enthalpy of an electrolyte (solution enthalpy) with Cobra4 P3020761
Determination of the enthalpy of neutralisation with Cobra4 P3020861
Determination of the melting enthalpy of a pure substance with Cobra4 P3020961
Conversion of light into motion with a solar cell P9501160
Conversion of electrical energy into thermal energy P9501360
Conversion of electrical energy into mechanical energy and vice versa P9501460
Voltage and current of a solar cell - Influence of surface area and lighting P9502160
Voltage and current in a series and parallel connection of solar cells P9502260
Operating a LED with solar energy P9502360
The solar cell as a diode P9502460
Storage of electrical energy of a solar cell with the aid of an accumulator P9502560
Storage of the electric energy from a solar cell with theaid of capacitor P9502660
The characteristic current-voltage curves of a solar cell P9502760
Generation of hydrogen and oxygen and the characteristiccurve of a PEM electrolyseur P9504160
Faraday efficiency and energetic efficiency of a PEMelectrolyser P9504260
Current-voltage characteristic and power of a PEM fuel cell P9504560
Efficiency of an electrolyseur-fuel cell-system P9504760
Electrical energy from wind energy - Influence of wind speed, wind direction and load P9505160
Influence of number of rotor blades P9505260
Storage of electric energy from wind energy with an accumulator P9505360
Storage of the electric energy won from wind energy in a capacitor P9505460
Current-voltage characteristic of a wind wheel P9505560
Running water driving a generator - determination of the power P9506360
Peltier effect: Heat pump P9507260
Cobra4 extension set for renewable energy: electric parameters, temperature 15608-88
Faraday efficiency and energetic efficiency of a PEM fuel cell P9504660

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