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The current flowing in an electrical or electronic circuit can suddenly increase when a component part fails. This can cause serious damage to other components in the circuit, or create a fire hazard. To protect against this, a fuse or a device called a "circuit breaker" can be wired into a circuit.
Drawings for electronic circuits are called "circuit diagrams". Drawings for electrical circuits are called "wiring diagrams". Like other diagrams, these diagrams are usually drawn by draftsmen, and then printed. Diagrams may also be created digitally using specialized software.
They have been widely used in primary and secondary education (e.g. Duit 1991; de Bóo and Asoko 2000; Asoko and Boo 2001). Analogies are particularly suitable for use in physics (Reiners and Glynn 1995; Kircher and Hauser 1995). They are ideal for teaching principles relating to electricity (Dupin and Johsua 1989, Cosgrove 1995). Students can use analogies to relate with something they are already familiar with and see the similarities between the two systems.
We frequently use analogies to teach about electricity and electric circuits and have found them to provide an evocative method to bring this topic to life. The topic of electricity has the added difficulty of having specialised and often unfamiliar vocabulary which students have to learn; use of analogies helps students learn these new words.
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