![DC Power Supply 20 V, 5 A
(115 V, 50/60 Hz), 1003311 [U33020-115], Power Supplies](/imagelibrary/U33020-115/U33020-115_01_DC-Power-Supply-20-V-5-A-115-V-5060-Hz.jpg)
| Product Information: .. |
| Specifications: .. |
| Mains voltage: | 115 V ±10% (50/60 Hz) |
| DC output: | 0 – 20 V; 0 – 5 A |
| Output power: | 100 W |
| Stability under full load: | ≤0.01% + 5 mV |
| ≤0.2% + 5 mA | |
| Residual ripple: | ≤1 mV; 3 mA |
| Displays: | 2 x 3 digit LED |
| Terminals: | 4 mm safety sockets |
| Dimensions: | 130 mm x 150 mm x 300 mm approx. |
| Weight: | 4.7 kg approx. |
| Weight | 12.02 lb |
| Dimensions | 13.8 x 7.9 x 8.7 in |
| Brand | 3B Scientific |
![Helmholtz Coils D -
for experiments with electron tubes of the D series, 1000644 [U191051], Electron Tubes D](/thumblibrary/U191051/U191051_01_140_140_Helmholtz-Coils-D-for-experiments-with-electron-tubes-of-the-D-series.jpg)
![DC Power Supply 20 V, 5 A
(230 V, 50/60 Hz), 1003312 [U33020-230], Power Supplies](/thumblibrary/U33020-230/U33020-230_01_140_140_DC-Power-Supply-20-V-5-A-230-V-5060-Hz.jpg)
![Experiment: Ohm’s Law (115 V, 50/60 Hz), 8000612 [UE3020320-115], Charge transport and current](/thumblibrary/UE3020320-115/UE3020320-115_01_140_140_Experiment-Ohm-s-Law-115-V-5060-Hz.jpg)
![Experiment: Maltese-Cross Tube, Supplement (115 V, 50/60 Hz), 8000661 [UE3070300S-115], Electron tubes](/thumblibrary/UE3070300S-115/UE3070300S-115_01_140_140_Experiment-Maltese-Cross-Tube-Supplement-115-V-5060-Hz.jpg)
![Experiment: Photovoltaic Systems (115 V, 50/60 Hz), 8000777 [UE8020100-115], Photovoltaics](/thumblibrary/UE8020100-115/UE8020100-115_01_140_140_Experiment-Photovoltaic-Systems-115-V-5060-Hz.jpg)
![Experiment: Induction in a Moving Conductor Loop, Basic equipment (115 V, 50/60 Hz), 8000627 [UE3040200-115], Induction](/thumblibrary/UE3040200-115/UE3040200-115_01_140_140_Experiment-Induction-in-a-Moving-Conductor-Loop-Basic-equipment-115-V-5060-Hz.jpg)
![Experiment: Stefan-Boltzmann law (115 V, 50/60 Hz), 8000692 [UE4050200-115], Intensity of Radiation](/thumblibrary/UE4050200-115/UE4050200-115_01_140_140_Experiment-Stefan-Boltzmann-law-115-V-5060-Hz.jpg)
![Experiment: Stirling Engine G (115 V, 50/60 Hz), 8000596 [UE2060250-115], Thermodynamic cycles](/thumblibrary/UE2060250-115/UE2060250-115_01_140_140_Experiment-Stirling-Engine-G-115-V-5060-Hz.jpg)
![Experiment: Lorentz Force (115 V, 50/60 Hz), 8000620 [UE3030300-115], Magnetic fields](/thumblibrary/UE3030300-115/UE3030300-115_01_140_140_Experiment-Lorentz-Force-115-V-5060-Hz.jpg)
![Experiment: Voltage on a Plate Capacitor (115 V, 50/60 Hz), 8000603 [UE3010800-115], Electrostatics](/thumblibrary/UE3010800-115/UE3010800-115_01_140_140_Experiment-Voltage-on-a-Plate-Capacitor-115-V-5060-Hz.jpg)
![Experiment: Normal Zeeman Effect (115V, 50/60 Hz), 8001261 [UE5020850-115], Fundamentals of Atomic Physics](/thumblibrary/UE5020850-115/UE5020850-115_01_140_140_Experiment-Normal-Zeeman-Effect-115V-5060-Hz.jpg)
![Experiment: Fabry-Pérot-Interferometer, Determination of Bohr magneton (115V, 50/60 Hz), 8001263 [UE5020900-115], Fundamentals of Atomic Physics](/thumblibrary/UE5020900-115/UE5020900-115_01_140_140_Experiment-Fabry-Perot-Interferometer-Determination-of-Bohr-magneton-115V-5060-Hz.jpg)
![Experiment: Electric Balance (115 V, 50/60 Hz), 8000762 [UE3030350-115], Magnetic fields](/thumblibrary/UE3030350-115/UE3030350-115_01_140_140_Experiment-Electric-Balance-115-V-5060-Hz.jpg)
![Experiment: Heat conduction (115 V, 50/60 Hz), 8000580 [UE2020100-115], Heat transport](/thumblibrary/UE2020100-115/UE2020100-115_01_140_140_Experiment-Heat-conduction-115-V-5060-Hz.jpg)
![Experiment: Anomalous + Normal Zeeman Effect, Hyperfine Structure, Fabry-Pérot Interferometer, Bohr Magneton (115V, 50/60 Hz), 8001131 [UE5020800-115], Fundamentals of Atomic Physics](/thumblibrary/UE5020800-115/UE5020800-115_01_140_140_Experiment-Anomalous-Normal-Zeeman-Effect-Hyperfine-Structure-Fabry-Perot-Interferometer-Bohr-Magneton-115V-5060-Hz.jpg)
![Experiment: Inverse square law (115 V, 50/60 Hz), 8000690 [UE4050100-115], Intensity of Radiation](/thumblibrary/UE4050100-115/UE4050100-115_01_140_140_Experiment-Inverse-square-law-115-V-5060-Hz.jpg)
![Experiment: Perrin tube (115 V, 50/60 Hz), 8000663 [UE3070400-115], Electron tubes](/thumblibrary/UE3070400-115/UE3070400-115_01_140_140_Experiment-Perrin-tube-115-V-5060-Hz.jpg)
![Experiment: Dielectrics in plate capacitors (115 V, 50/60 Hz), 8000785 [UE3010850-115], Electrostatics](/thumblibrary/UE3010850-115/UE3010850-115_01_140_140_Experiment-Dielectrics-in-plate-capacitors-115-V-5060-Hz.jpg)
![Experiment: Waltenhofen’s Pendulum (115 V, 50/60 Hz), 8000631 [UE3040400-115], Induction](/thumblibrary/UE3040400-115/UE3040400-115_01_140_140_Experiment-Waltenhofen-s-Pendulum-115-V-5060-Hz.jpg)
![Experiment: Voltage Dividers (115 V, 50/60 Hz), 8000616 [UE3020340-115], Charge transport and current](/thumblibrary/UE3020340-115/UE3020340-115_01_140_140_Experiment-Voltage-Dividers-115-V-5060-Hz.jpg)
![Experiment: Internal energy and electrical work (115 V, 50/60 Hz), 8000587 [UE2030400-115], Internal Energy](/thumblibrary/UE2030400-115/UE2030400-115_01_140_140_Experiment-Internal-energy-and-electrical-work-115-V-5060-Hz.jpg)
![Experiment: Photoconductivity (115 V, 50/60 Hz), 8000775 [UE6020400-115], Conduction Phenomena](/thumblibrary/UE6020400-115/UE6020400-115_01_140_140_Experiment-Photoconductivity-115-V-5060-Hz.jpg)
![Experiment: Speed of sound in air (115 V, 50/60 Hz), 8000566 [UE1070310-115], Acoustics](/thumblibrary/UE1070310-115/UE1070310-115_01_140_140_Experiment-Speed-of-sound-in-air-115-V-5060-Hz.jpg)
![Experiment: Kirchhoff’s Laws (115 V, 50/60 Hz), 8000614 [UE3020330-115], Charge transport and current](/thumblibrary/UE3020330-115/UE3020330-115_01_140_140_Experiment-Kirchhoff-s-Laws-115-V-5060-Hz.jpg)
![Experiment: Hall-effect in semiconductors (115 V, 50/60 Hz), Basic equipment, 8000727 [UE6020200-115], Conduction Phenomena](/thumblibrary/UE6020200-115/UE6020200-115_01_140_140_Experiment-Hall-effect-in-semiconductors-115-V-5060-Hz-Basic-equipment.jpg)
![High Voltage Power Supply 5 kV (115 V, 50/60 Hz), 1003309 [U33010-115], Power Supplies](/thumblibrary/U33010-115/U33010-115_01_140_140_High-Voltage-Power-Supply-5-kV-115-V-5060-Hz.jpg)
![Set of 15 Experiment Leads, 75 cm 1 mm², 1002840 [U13800], Circuits](/thumblibrary/U13800/U13800_01_140_140_Set-of-15-Experiment-Leads-75-cm-1-mm.jpg)
![Set of 15 Safety Experiment Leads, 75 cm, 2.5 mm², 1002843 [U138021], Circuits](/thumblibrary/U138021/U138021_01_140_140_Set-of-15-Safety-Experiment-Leads-75-cm-25-mm.jpg)
![Set of Experiment Leads for Electron Tube Experiments, 1002847 [U138101], Experiment Leads and Cables](/thumblibrary/U138101/U138101_01_140_140_Set-of-Experiment-Leads-for-Electron-Tube-Experiments.jpg)
![Tube Holder D -
for the experimental setup of tubes of series D, 1008507 [U191001], Electron Tubes D](/thumblibrary/U191001/U191001_01_140_140_Tube-Holder-D-for-the-experimental-setup-of-tubes-of-series-D.jpg)
![Deflection Tube D, 1000651 [U19155], Electron Tubes D](/thumblibrary/U19155/U19155_01_140_140_Deflection-Tube-D.jpg)
![High Voltage Power Supply 5 kV (230 V, 50/60 Hz), 1003310 [U33010-230], Power Supplies](/thumblibrary/U33010-230/U33010-230_01_140_140_High-Voltage-Power-Supply-5-kV-230-V-5060-Hz.jpg)
![Water Wave Channel, 1000807 [U8431411], Water Waves](/thumblibrary/U8431411/U8431411_01_140_140_Water-Wave-Channel.jpg)
![Optical rider D , 90/50, 1002635 [U103111], Optics with an Optical Bench](/thumblibrary/U103111/U103111_01_140_140_Optical-rider-D-9050.jpg)
![Rotating Object Holder on Stem, 1003016 [U17001], Optical Components on Stem](/thumblibrary/U17001/U17001_01_140_140_Rotating-Object-Holder-on-Stem.jpg)
![Optical Bench U, 1200 mm, 1003039 [U17150], Optics with an Optical Bench](/thumblibrary/U17150/U17150_01_140_140_Optical-Bench-U-1200-mm.jpg)
![Rail Supports, Pair, 1003044 [U171661], Optics with an Optical Bench](/thumblibrary/U171661/U171661_01_140_140_Rail-Supports-Pair.jpg)
![Red Laser Diode, 650 nm, 1003201 [U22000], Optical Lamps on Stem](/thumblibrary/U22000/U22000_01_140_140_Red-Laser-Diode-650-nm.jpg)
![Polarisation Filter on Stem, 1008668 [U22017], Optical Components on Stem](/thumblibrary/U22017/U22017_01_140_140_Polarisation-Filter-on-Stem.jpg)
![Liquid Levels, 1003509 [U58020], Pressure](/thumblibrary/U58020/U58020_01_140_140_Liquid-Levels.jpg)
![Friction Measuring Apparatus -
investigation of static and kinetic friction, 1009942 [U8405120], Friction](/thumblibrary/U8405120/U8405120_01_140_140_Friction-Measuring-Apparatus-investigation-of-static-and-kinetic-friction.jpg)
![Speed of Light Meter (115 V, 50/60 Hz), 1000881 [U8476460-115], Speed of Light](/thumblibrary/U8476460-115/U8476460-115_01_140_140_Speed-of-Light-Meter-115-V-5060-Hz.jpg)
![Determination of Planck's Constant (h) Apparatus, 1000917 [U8482460], Fundamentals of Atomic Physics](/thumblibrary/U8482460/U8482460_01_140_140_Determination-of-Plancks-Constant-h-Apparatus.jpg)
![Pair of Pole Shoes D, 1000978 [U8497200], Demountable Transformer D](/thumblibrary/U8497200/U8497200_01_140_140_Pair-of-Pole-Shoes-D.jpg)