Cell and bulb

Many pupils will try to connect only one terminal on the cell to one on the bulb. Even when they use both ends of the battery they do not appreciate that the bulb, too, has two terminals. Electric current must be able to flow through all components, allowing electrical energy to be transferred from the cell to the bulb. Young children see a single mains wire going to appliances at home, and later, when we give them bulbs in holders, they see the bulb apparently 'sitting' on the wire. All circuit work should start with 'naked' bulbs, and the presence of two terminals on all normal electrical equipment can be pointed out (see Chapter 13). (See Ross et al. 2002: CD -Energy and Home).

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