Physics
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Electrostatic
Braun Electroscope with Accessories
Rugged and sensitive electroscope with various accessories to change its capacitance. A sensitive aluminum vane is balanced in a vertical position on a metal support which is insulated from its base. Four attachments, each equipped with a banana plug which fits the vane system top are included, a 3-inch conducting sphere, a proof plane with detachable insulating handle and an aluminum cup (Faraday Ice Pail). With instructions.
PH45270 -
Electrostatic
Coulomb Meter
Coulomb Meter is designed to use as a digital electroscope. The LCD display will show the number of coulombs deposited into the instrument either by source of static electricity (a charged plastic rod) current through a resistance or from a capacitor. This instrument shows the charge digitally in Coulombs up to 1999 nC. Accuracy ±10 nC.
PH45271 -
Electrostatic
Electrostatic Kit
Comprising one electroscope, one packet of metal leaves, 4 metalized spheres, 1 reel of nylon thread, two polythene plates 75 x 75 mm, one electrophorus plate with insulating handle, 1 proof plane, Two aluminium cans, one cellulose acetate strip, 1 polythene strip, and one stirrup for suspending strips, one flannel rubber, one wire hook and instructions.
PH45272 -
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Electricity
Circuit Breaker Demonstration
Investigate the working principle of circuit breaker type fuse, with this demonstration model. The apparatus is built on a robust plastic base and includes resistive loads to simulate external wiring circuits. Applications of the thermal response of bimetal strips and also electromagnetism (movement from a solenoid) are clearly demonstrated in this model.
When a 12VDC supply is connected (not supplied) the LED lights to show that current is flowing in the external circuit and the bi-metal strip can be seen to bend as its heater coil raises the temperature. After a few minutes the bending is sufficient to trip the mechanism and the current path is broken. At any current selection a short circuit situation can be initiated by pressing the red button and this produces an immediate response from the solenoid to disconnect the supply.PH50136C -
Electricity
Earth, Neutral and Live Board Demonstration
This apparatus is an effective demonstration of how the earth wire and fuse act together to protect both the user and the appliance.
When the appliance is connected correctly and the LEDs in the appliance will illuminate to show the appliance is working. A fault is then demonstrated by swapping the live wire from inside the appliance to the case to show either the fuse melts (protecting the user and appliance) or in the case of no earth wire, the LEDs illuminate to indicate the passage of current through the person to ground. The fuse is easily visible and can be seen to ‘blow’ when a fault occurs. The unit is supplied with 10 meters of fuse wire and full instructions. A 12V D.C. power supply is required. Connections are made via 4mm shrouded sockets.PH50136E
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