Electrical circuits.

Once children can set up a circuit that lights one bulb, it is possible to ask them to discover how to light more than one bulb with just one battery or cell. This may well lead to a surprising discovery. There are two different types of circuit.

 

A Series Circuit. This type of circuit has only one loop, e.g.

 

A Parallel Circuit. This type of circuit contains more than one loop, e.g.

These two types of circuit behave quite differently from each other.

 

Let us call the brightness of one bulb in series with one cell normal brightness. When more bulbs are added into a series circuit, they become dimmer:

This is not so for a parallel circuit. Bulbs can continually be added in parallel and they will all be at normal brightness. The battery will run down faster though!

Contents

Safety, Static Electricity
Charge
Current Electricity, Making a bulb light, Models
Atomic Theory
Conductors and insulators
Switches, Short circuits, Circuit diagrams
Current, Voltage
Measuring current
Resistance
Power
Assessment/Discussion Material
Reference Material