Knife Switch, Double Pole, Double Throw

Used for low-voltage experiments.

DPDT switch is a switch that can switch to the two circuits

Can be used in both AC or DC circuit

Useful as a basic component for electrical laboratory.

 

Gold Leaf Electroscope

This instrument is used for the detection of charge and measuring

static electricity.It works on the principle that the like charges repel

each other.

 

Static and Kinetic Friction

Static friction is what keeps the box from moving without being pushed, and it must be overcome with a sufficient opposing force before the box will move. Kinetic friction (also referred to as dynamic friction) is the force that resists the relative movement of the surfaces once they're in motion.

 

SLOTTED SET OF MASSES AND HANGER. Set of 9 slotted masses, one hanger

 

A Pulley as a Simple Machine

A pulley is a simple machine consisting of a wheel turning on an axle. Pulleys are often used singly and in combinations to do work.

 

RESISTOR

1K resistor

200 ohms resistor

 

HONG KONG SCIENTIFIC CO 香港科学仪器社 CONSTANTANT SWG 26

 

10 Ohms Rheostat

 

Griffin & George Limited-10 Ohms Rheostat

 

Pencil Lead Conducts Electricity

Pencils Lead Conduct Electricity and Act as Resistors Too.

The “lead” in a pencil isn't actually made from lead. It is made from a form of carbon called graphite. The graphite is mixed with clay and formed into long thin pencil lead.

 

Cable Peeler - kabel abisolierung

 

Foward current in diode.

A diode is a semiconductor device that essentially acts as a one-way switch for current. It allows current to flow easily in one direction, but severely restricts current from flowing in the opposite direction.

 

Heat - Bar and Gauge

After heating, the gauge shows that the bar has increased in length, which is called linear expansion

 

Sanwa Analog Multitesters YX360TRD

Case and instrument in one body, convenience to carry and store.

 

Heat - Ball and Ring

 

After heating, the metal balls expands and is unable to go through the ring.

Dynamics Trolleys, Wooden

Long wooden trolleys, mounted on threewheel.

 

GW Instek GPC-3030 Analog DC Power Supply

• Triple Output
• 5V, 3A Fixed output

 

British Optical Lens Co-Bi-Concave lens

 

The resistance of a wire depends on the resistivity of the wire。

 

Constantant swg 28 vs Nichrome swg 28 vs Cooper swg 28

Nichrome, a non-magnetic 80/20 alloy of nickel and chromium, is the most common resistance wire for heating purposes because it has a high resistivity and resistance to oxidation at high temperatures.

A MODEL TRANSFORMER

Working Principle of A Transformer

• A transformer consists of a primary coil and a secondary coil wound on a soft iron core.
• When an alternating current flows in the primary coil, a changing magnetic flux is generated around the primary coil.
• The changing magnetic flux is transferred to the secondary coil through the iron core.
• The changing magnetic flux is cut by the secondary coil, hence induces an e.m.f. in the secondary coil.
• The magnitude of the output voltage can be controlled by the ratio of the number of primary coil and secondary coil.

 

Short circuits

 

A short circuit is a fault.  It means there is a very low resistance conducting path from one side of a component to the other. 

Audio Signal Generator AG-202A

Country: Japan

Manufacturer / Brand: Kenwood, Trio-Kenwood Inc.; Komagane

Year: 1970 ??

 

Diffraction Grating

To produce a bright and sharp interference pattern for light, a diffraction grating is used in preference to a Young's double slit.

A diffraction grating consists of many equally-spaced slits placed extremely close together, e.g., 300 lines/mm.

 

Plug key

A plug key is an electronic component whose function is similar to that of a switch. A small metallic key is present which when pressed the switch turns on and when we remove it from its base the circuit gets off.
 

Light bulbs in a series circuit.

In a series circuit, every device must function for the circuit to be complete. One bulb burning out in a series circuit breaks the circuit. 

How is the voltmeter and ammeter connected in a circuit?

A voltmeter is connected in parallel with a device to measure its voltage, while an ammeter is connected in series with a device to measure its current.

 

 

Light bulbs in a parallel circuit.

 

Light bulbs in parallel

Two bulbs in a simple parallel circuit each enjoy the full voltage of the battery. This is why the bulbs in the parallel circuit will be brighter than those in the series circuit. Another advantage to the parallel circuit is that if one loop is disconnected, then the other remains powered.