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Wiring Diagram For Telephone Jack

Transformer Two coils of wire linked by an iron core. Transformers are used to step up (increase) and step down (decrease) AC voltages. Energy is transferred between the coils by the magnetic field in the core, there is no electrical connection between the coils.

Fuse A safety device which will blow (melt) if the current flowing through it exceeds a specified value.

Heater A transducer which converts electrical energy to heat.

If the circuit is complex: Try to arrange the diagram so that signals flow from left to right: inputs and controls should be on the left, outputs on the right. You may omit the battery or power supply symbols, but you must include (and label) the supply lines at the top and bottom.

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