Electric Bell

Description

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

Description

Generates both AC and DC. When the two brushes of the generator are put in the two ends of the commutator, the output is an AC. When the brushes are put in the middle of the commutator, the output is a DC. Includes Instructions.

Description

Each plate is fitted with a 4 mm socket terminal.

Material	Size
Zinc	90 x 25 x 1.5 mm
Copper	90 x 25 x 1.5 mm
Lead	90 x 25 x 1.5 mm
Carbon	90 x 25 x 6

Description

A cycle dynamo with crank handle, is fitted on base with two output terminals which are connected in parallel to a lamp holder with a lamp.