When the light bulb is connected to a source of electricity, the electricity can easily travel along the thick wires to the light bulb. But they also make a lot of heat – in fact, it’s only by getting very hot that they can light up at all – and this is seen as being wasteful of energy. These types of light bulbs are now mostly used in vehicles and low cost pocket torches because they are cheap and reliable. Tungsten is used in light bulbs because it has a really high melting point (over 3,000☌), which is much higher than the temperature needed to give a nearly white light (2,000☌). If you have a question you’d like an expert to answer, send it to We won’t be able to answer every question, but we’ll do our very best. And look inside in each and every device to understand their functioning.Curious Kids is a series by The Conversation, which gives children the chance to have their questions about the world answered by experts.
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