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Electricity & Magnetism A quick review of what we’ve learned… through videos! Relating Electricity & Magnetism Watch this video. Create some hypotheses to explain what you saw. Relating Electricity & Magnetism 1. Under what conditions did the wire jump? 2. Are stationary electric charges affected by magnetic fields? 3. What about moving electric charges? Relating Electricity & Magnetism How can we explain this behavior thinking about magnetic fields? Pg. 563, Figure 2 Motor Principle A current-carrying conductor crossing an external magnetic field, experiences a force perpendicular to the magnetic field and the direction of the current. Motor Principle Right Hand Rule #3 - Thumb in direction of conventional current - Fingers in direction of magnetic field - Palm facing direction of force Practice Determine the direction of the force on the conductor: Motor Parts of a Motor Cell – Provides current Field magnet – Provides external magnetic field Coil - Part of the motor that rotates (armature) Commutator – “Split ring” that rotates with the coil Brushes – Connects commutator and cell Motor Principle For a motor to turn continuously, the current must change direction in the loop. In a DC or directcurrent motor, this is accomplished with brushes & the splitring commutator Parts of a Motor Name the parts of the motor that are labelled in the diagrams below! Motor Principle Motor Principle Motor Motor Principle Motor Motor Motor Homework Pg. 566 #1, 2 Pg. 571 #1, 2