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Transformers

Transformers -  working & applications (step up and step down) | A.C. | Physics | Khan Academy

<p>An outlet in North America outputs electricity at 120 V, but a typical laptop needs to operate at around 20 V. In order to do so, a transformer is placed in a laptop’s power supply. If the coil in the circuit connected to the laptop has 20 turns, how many turns must the coil in the circuit with the outlet have?</p>

 A transformer has 200 turns in the primary and 25 turns in the secondary. If the primary is hooked up to a <math display='inline'><mrow><mn>120</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">V</mi></mrow></math> household outlet, what is the potential across the secondary coil? 

Anderson Video - Transformers

Transformers - A Common Way to Change Voltage | Physics with Professor Matt Anderson | M24-13

Transformers | Magnetism | Physics | FuseSchool

Anderson Video - Transformer Example

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