How do step-up and step-down transformers work with AC voltage?

Transformers are passive electrical components that transfer energy between circuits using electromagnetic induction without any metallic connection. A varying current in one coil produces a changing magnetic flux in a shared core, which induces a varying electromotive force in other coils. Step-up and step-down transformers use these principles to increase or decrease alternating current voltage levels respectively.

What we know

• A varying current in any coil of a transformer produces a varying magnetic flux in its core, which is based on principles discovered by Michael Faraday. [2, 3]
• A changing magnetic flux induces a varying electromotive force across any other coils wound around the same core. [2]
• Transformers can be used as step-up or step-down types to increase or decrease alternating current voltage levels. [2]
• Electrical energy is transferred between separate coils without a conductive connection between the circuits, designating it as a passive electronic component. [1, 2]

Where to go next

• how we knowWhat was Michael Faraday's contribution to induction?
• a case in pointHow do constant-voltage speaker systems use transformers?
• the bigger pictureWhat are passive electronic components?
• compared withHow do DC-to-DC converters differ from transformers?
• whenWhen was the first constant-potential transformer invented?
• an unexpected connectionHow do audio speakers connect to power transmission concepts?Audio speaker networks utilize step-up and step-down transformers to minimize power loss over cables, sharing fundamental induction principles with giant power grid transformers.

Sources

• [1]transformer (Wikidata Q11658) · CC0 1.0
• [2]Transformer · CC BY-SA 4.0
• [3]Transformer types · CC BY-SA 4.0
• [4]Constant-voltage speaker system · CC BY-SA 4.0
• [5]DC-to-DC converter · CC BY-SA 4.0