During Science today, Year 4 have been learning about electrical circuits. They discovered what makes a circuit complete, which meant they were then able to identify incomplete and complete circuits. The children then experimented with this by building their own circuits using a battery (cell), crocodile clip wires and bulbs. First, they used only one bulb in their circuit and they noticed that the bulb was very bright. Then, they added a second bulb and observed what happened. After this they added switches to their circuits allowing them to switch the bulb on and off without disconnecting the battery. Year 4 also discovered that the size of a battery did not always indicate how powerful it was. The children learnt that the power of a battery is messaged in volts (V), and that one of the smaller sized batteries was infact the most powerful.