5 Electricity and Magnetism 5.2 Capacitance, Dielectrics, Electric Energy, Storage
P2420201
Charging curve of a capacitor / charging and discharging of a capacitor
Course of current with time at different capacitance values; voltage and resistance are constant (U = 9 V, R = 2.2 M).
Principle A capacitor is charged by way of a resistor. The current is measured as a function of time and the effects of capacitance, resistance and the voltage applied are determined. Tasks 1. using different capacitance values C, with constant voltage U and constant resistance R 2. using different resistance values (C and U constant) 3. using different voltages (R and C constant). To determine the equation representing the current when a capacitor is being charged, from the values measured. What you can learn about
Function and Applications
Equipment and technical data
Main articles 13505-93 06219-32 07123-00 06030-00 06030-23 39113-01 39113-03
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Power supply 0...12 V DC/ 6 V, 12 V AC, 230 V High quality power supply specially suitable for student experiments in electricity and electronics as well as for demonstration.
Charging Discharging Time constant Exponential function Half life
Power supply 0...12 V DC/ 6 V, 12 V AC, 230 V Capacitor,2x30 micro-F DMM, auto range, NiCr-Ni thermocouple Two-way switch, single pole Connection box Capacitor 1 microF/ 100V, G2 Capacitor 4,7microF/ 100V, G2
Switch-on behaviour of a capacitor and an inductivity with Cobra4 P2420260
▪ To measure the charging current over time:
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Cobra4 Experiment - available 2013
1 1 1 1 2 1 1
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Stabilised, Shortcircuit proof Output voltage: 1...12 V DC, 6 V / 12 V AC Rated current: DC 0...2 A / AC 5 A Ripple: max 1 mV Resistance: 1 mOhm Mains voltage: 230 V Housing dimensions: 194 x 140 x 130 mm
13505-93