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# Electric currents, magnetic fields

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### Electric currents, magnetic fields

1. 1. Agenda Bell work• Magnet activity • Pick up and complete• Notes: Electricity and Crossword Puzzle Magnetism• Electromagnetic Induction• Circuits and Power Quiz tomorrow• Outline Chp. 14 pg 235-245• Review Questions 1-17
2. 2. Electric Currents,Magnetic Fields May 7, 2012
3. 3. Objectives1. Describe the magnetic field produced by a current-carrying wire2. Give examples of how the field can be made stronger
4. 4. We KNOW Electric wire can be made to have a current Magnet has a magnetic field surrounding it
5. 5. Interaction An electric current produces a magnetic field Magnetic field makes up a pattern of circles
6. 6.  When the current is reversed the direction of the magnetic field is also reversed If a current carrying wire is looped the magnetic field is intensified More loops means greater magnetic field
7. 7. Electromagnets If a piece of iron is placed in a current- carrying coil of wire, the iron will become a magnet – electromagnet (temporary magnet) Roller coasters Junk yards Electric trains
8. 8. Magnetic Forces on Wires If an electric current can produce a magnetic field Then, we can use a magnetic field to change an electric current We can use the combination of both to create a motor