Current Electricity | Electricity and Electromagnetism | PHYSICS
SCM: SIMPLE CIRCUIT MODULES
These modules may be used to construct simple circuits of the type normally implemented on, for example, a Worcester Circuit Board. They are intended to introduce younger pupils to some of the more familiar applications of devices and circuits, the main emphasis being on simple electrical circuit work. The modules are 60 x 60mm and have 4mm plug connections.
A. Input Boards LDR
An ORP13, 4mm light dependent resistor; fully covered resistance of 10k; in normal room conditions resistance of 250 approximately.
B. Lamp 4.5V, 0.3A bulb in a holder.
E8H27635 C. LED Boards
Large light-emitting diodes with series resistors of 220 for p.ds up to 6V. E8H27842
E8H28366 D. Motor
each £9.95 each £9.95
A low-voltage d.c. motor with series resistor to limit current consumption. E8H27908
E. Buzzer A low-current buzzer (approx 2mA).
E8H28019 F. Reed Relay
A current through the coil produces magnetism to cause the reed to switch another circuit; the reed contacts are protected from short circuit damage by a low-value series resistor.
E8H28147 G. Thermistor Unit
A cluster of 5 VA1108s in parallel; resistance approximately 200 at 90°C. E8H28202
each £13.95 H. Light Dependent Resistor Unit
A cluster of 3 ORP12s in parallel; resistance approximately 200 in room lighting to give greater sensitivity and control the current in a reed relay.
E8H28287 I. Transistor Board
Based on an NPN TIP47 transistor with 10 base resistor and 100 collector resistor. E8H28937
G each £20.95 H I each £21.95 each £40.95 E F each £18.95 each £12.95 C D each £12.95 A B