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Download Electromagnetic induction Electric currents generate magnetic fields
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Transcript
Electromagnetic induction Power generation Power transmission Transformers Electric currents generate magnetic fields demonstration 1 Electric currents are pushed on by magnetic fields demonstration Electric currents are generated by magnetic fields 2 Electric currents from magnetic fields Requires changing magnetic fields! demonstration What’s going on here? More coils = more current demonstration 3 Electric motors convert electricity to mechanical energy electric motor Electric generators convert mechanical energy to electricity Difference between AC and DC generators 4 Transformers! Oops… Transformers! Used to change voltage Step up Step down 5 Power transmission W=V×A Heat loss ∝ A How it works 1. 2. 3. Changing electric fields in primary coil generates magnetic field Core concentrates the magnetic field Magnetic field induces current in secondary coil demonstration 6 How it works Voltage change proportional to change in number of coils demonstration Field induction summary Changing electric fields → magnetic fields demonstration Changing magnetic fields → electric fields What’s going on? 7
