3B Scientific Drip Cup with Basin - Manual (Page 2)

Elwe Didactic GmbH • Steinfelsstr. 6 • 08248 Klingenthal • Germany • www.elwedidactic.com
3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany • www.3bscientific.com
Subject to technical amendments.
4. Operation
In order to conduct the experiment, the following
apparatus is additionally required:
1 Electric field meter 8533011
1 Escola 10 multimeter 8531160
1 Plastic rod 1501517
1 Retort stand, V-base 8611160
1 Stainless steel stand rod 8611330
1 Cross-bosshead 8613170
• Connect the collector to the electric field me-
ter.
• Insert the rubber stopper connected to the
glass stopcock into the hole in the drip cup.
• Set up the drip cup on the stand so that the
glass stopcock is approximately 10 cm above
the collector.
• Half fill the drip cup with water.
• Switch on the electric field meter.
• Use the plastic rod to induce a charge on the
collector.
• Use the voltmeter to measure and record the
charge on the collector.
• Open the glass stopcock to allow the water to
drip, drop by drop, into the collector below.
• Count the number of drops and observe the
voltmeter readings.
• Read the charge recorded by the meter after
every drop of water.
Offset E U 1 Volt
V = V 10 V
10 V
0
Fig. 1: Experiment set-up for drip cup with collector