Magnetism & Electromagnetism

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9 Terms

1
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Permanent magnet

always magnetic.

2
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Induced magnet

becomes magnetic in a field.

3
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Electromagnet

coil with current that produces a magnetic field

4
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Motor effect

force on a current in a magnetic field

5
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F

F=BIL — force on a wire

6
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Transformers

Transformers: Vp/Vs=Np/Ns

7
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idek

Vp​Ip​=Vs​Is​ — (if 100% efficient)

8
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How does increasing current affect the force on a wire in a magnetic field?

From F=BILF = BILF=BIL: if current (I) increases, force (F) increases proportionally, assuming B and L are constant.
✅ Force increases.

9
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A transformer has 1000 turns on primary and 200 on secondary. If input is 240 V, what is the output voltage?

Vp/Vs=Np/Ns→240/Vs=1000/200 240/Vs=5→Vs=240/5=48 V