Coil, 240 Turns

To demonstrate the characteristics of simple and primary cells. Consists of a plastic jar with a screw-on plastic rim containing two adjustable electrode holders, eight electrodes of different metals and a porous ceramic cup. With Instructions.

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 metres of fuse wire and full instructions. A 12V D.C. power supply is required. Connections are made via 4mm shrouded sockets.

The large size of this battery operated apparatus allows students to better understand the operation of this basic circuit. Works on 9V Battery. with Instructions. On wooden stand. without battery.