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Transcript
Do now! Can you continue with the ‘Draw the sentences’ from last lesson? This is to be FINISHED FOR HOMEWORK. Due next Friday 16th September. Today’s lesson • Plotting magnetic fields • Electromagnetic induction Plotting magnetic fields Can you gather around Mr Porter? Quietly and sensibly Plotting magnetic fields Magnetic field lines The arrows show the direction a compass needle would point at that point in the field. The closer the field lines are, the stronger the magnetic force felt Field around a bar magnet Electromagnetic induction • Can you carefully wind your wire around the cardboard tube? Electromagnetic induction • Put your coil in this circuit. The multimeter should be on the μA scale. μA Electromagnetic induction • MOVE a magnet in and out of the coil. Watch the meter! μA Electromagnetic induction If a magnet is moved inside a coil an electric current is induced (produced) Electromagnetic induction If a magnet is moved inside a coil an electric current is induced (produced) COPY this please! Electromagnetic induction A electric current is induced because the magnetic field around the coil is changing (the coil ‘cuts through’ the lines of field). COPY this please! Gather round • http://phet.colorado.edu/sims/faraday/gene rator_en.jnlp Can you stick this in please? Generator/dynamo A generator works by rotating a coil in a magnetic field (or rotating a magnet in a coil). A slip-ring commutator produces alternating current (a.c.) COPY this please! Let’s try some questions! Pages 215 and 219.
