Technical data The self-induction during the switch-on process with Cobra SMARTsenseArticle no: P1377069 ![]()
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
Principle The students know that a voltage is induced in a coil as long as the magnetic field encompassed by the coil changes. They are familiar with the electromagnet and therefore also know that a current-carrying coil has a magnetic field and what the strength of the magnetic field depends on. This magnetic field must first be built up after the DC circuit is closed and must be reduced after the circuit is opened. This results in a self-induction voltage in each case. Benefits
Tasks What effect does a coil have when closing a DC circuit? Using a parallel circuit of two incandescent lamps, investigate the effect of a coil installed in one of the branches. Learning Objectives With the experiment provided, the students should recognize that a self-induction voltage is produced when the lamp is switched on, which counteracts the increase in current.
| ||||||||||||
Robert-Bosch-Breite 10 – 37079 Göttingen – Germany
www.phywe.com


