Transformer
A device that transfers between windings through a changing . It can raise or lower according to the winding arrangement, with losses meaning output power is below input power. A site centre-tapped transformer also changes how its output is referenced to earth.
Using Transformer in context
Updated
A distinction worth remembering
A transformer transfers energy through changing magnetic flux. Turns ratio is useful in an ideal model, but real transformers also have losses and operating limits.
Questions to take further
- How can I revise Transformer beyond the definition?
- Explain what Transformer describes, compare it with a related term and use it in a topic question. State any assumptions and what evidence you would need before applying the idea to real work.
Sources
- OpenStax University Physics: Transformer operation — The physical principle used in this comparison; technical installation requirements remain separate.
Where Transformer fits in the learning path
The Electrical Science section covers these units:
- Circuit Fundamentals
Curriculum mapping: C&G 2365 Units 202/302.
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Read, practise, return
1. Read it in context
- 110 V Site Power ToolsSparks Basics
- Three-Phase PowerElectrical Science
2. Try recalling, then explore practice
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- Electrical Science — quiz previewFree · Electrical Science
3. Return to the meaning
After reading or practising, explain the idea in your own words, then check what you remembered.
Recall a related term
Which term fits this definition? Say it to yourself, then reveal it. This is a memory prompt, with no score or saved result.
Alternating current reverses direction repeatedly, unlike direct current. An AC voltage also changes polarity over its cycle. Frequency, measured in hertz (Hz), tells you how many complete cycles occur each second. In a three-phase system, the three AC waveforms are offset in time; three-phase does not mean three times the frequency.
Compare related terms
Open a meaning to compare its role with Transformer, or follow its full entry.
AC — Alternating Current
Alternating current reverses direction repeatedly, unlike direct current. An AC voltage also changes polarity over its cycle. Frequency, measured in hertz (Hz), tells you how many complete cycles occur each second. In a three-phase system, the three AC waveforms are offset in time; three-phase does not mean three times the frequency.
Read the AC entryElectromagnetic induction
The production of a voltage when the magnetic flux linking a conductor changes. Moving a conductor through a magnetic field or changing the field around a coil can cause it. This is the principle behind generators and transformers; the induced voltage depends on the rate of change, not simply on a magnet being present.
Read the Electromagnetic induction entryReduced low voltage
A site supply arrangement that lowers the voltage available to a person touching one live conductor and earth. A common 110 V centre-tapped transformer has an earthed midpoint, leaving about 55 V from either line to earth. Contact between both lines can still expose someone to 110 V, so damaged tools remain unsafe.
Read the Reduced low voltage entryA definition is a start. Using it in a real question is where it sticks.