The "Electricity" laboratory devices

1. Purpose

1.1. The package is intended for studying main regularities of "Electric phenomena" and "Direct current laws" courses. Students achieve practical skills in assembling electrical. The characteristics of some electric circuit elements are determined. The skill of utilizing measurement tools is achieved.

1.2. The package is intended for frontal experiments, school and college students' research.

2. The package contains:

· Key, 1 item
· Dish, 1 item
· Copper electrode, 2 items
· Zinc electrodes, 1 item
· Lamp with capsule, 2 items
· Wire-wound resistor, 2 items
· Variable resistor, 1 item
· Electromotor, 1 item
· Choke-coil, 2 items
· Band-pass magnet, 2 items
· Spring clip, 2 items
· Compass, 1 item
· Connection wire, 8 items
· Metal operating layout, 1 item
· Manual, 1 item
· Packing, 1 set

3. General instructions

The units essential for circuit assembling are fixed at stands. The magnets are pressed into these stands. The units are placed at metal operating layout. The spring clips are utilized for connecting electrodes via wires. The spring clips are fixed at wire's tips. The tip's design admits connecting several wires at one point. When the electrodes are installed and removed, one should place them into the middle part of pan. Then the electrodes are removed.

4. Basic features

· Operating layout sizes, 310 mm x 200 mm

· Element's foundation sizes, 35 mm x 70 mm

· Diameter of nichrome resistor wire, 0.36 mm and 0.25 mm

· Resistance of wire-round resistors, 6 Ohm and 12 Ohm

· Maximal resistance or variable resistor (3 A current), 10 Ohm

· 3.5 V lamp, 0.25 A current

· 6.3 V lamp, 0.35 A current

· Diameter of wire at 220 turns coil, 0.2 mm

· Compass constant, 5°

· Band-pass magnet sizes, 15 mm x 15 mm x 70 mm

· Nominal motor voltage, 4.2 V

· Life time, over 7 years

5. List of demonstration experiments

· Electric circuit assembling and subcircuit current measuring
· Subcircuit voltage measuring
· Current regulating by variable resistor
· Observing the current's chemical effect
· Assembling and testing the galvanic cell
· Observing subcircuit's current dependence on voltage
· Observing subcircuit's current dependence on resistance
· Resistance measuring by amperemeter and voltmeter
· Measuring lamp's power and energy
· Studying magnet field of permanent magnet
· Studying DC motor
· Measuring efficiency of electric motor
· Measuring source's EMF and internal resistance
· Measuring conductor's specific resistance
· Studying conductors' series connection
· Studying conductors' parallel connection
· Electron's charge definition
· Observing the current's dependence on magnetic field
· Studying the phenomenon of electromagnetic induction

6. Troubleshooting

There is no plugging contact

Widen the gap in plug's tip using the 4 mm x 0.25 mm screwdriver. Check clamp's fastening at cell's board. Pull the screw-nut using #7 front spanner.

The 3.5 V/6.3 V lamp is not lighting

Replace the lamp: push it slightly into chuck, turn it anticlockwise and remove it from chuck. The lamp is installed in reverse order.

The motor's axle is not turning

The current necessary to overcome starting momentum is low.

The key's knife is not positioned precisely

Check the key's petal fastening. Fasten it, if necessary. Check the key's knife. Install a new M3x10 screw, if necessary. Fix the screw-nut by paint.

The set of equipment necessary for package utilization

· Teacher's manual (not included, must be ordered apart)
· Capron thread
· A load with hook (of class's equipment set)
· (0 -- 6) V voltmeter (of class's equipment set)
· (0 -- 2) A or (-1 -- 1) A amperemeter (of class's equipment set)
· 4.5 V DC source or battery 36R type
· A strap or scale with millimeter degrees
· Stop-watch
· Scales with set of weights (of class's equipment set)
· Pair of compasses
· Salt
· Copper sulfate
· Sugar