Draw in the field lines When an ____________ current flows through a _______ of wire it creates a magnetic _______. The diagram below shows its shape . x Current flowing up a wire Current flowing down a wire

P6 – Electricity for Gadgets Lesson 10 – Electric motors Learning aim: Demonstrate an understanding of how an electric motor works

Success Criteria Learning Objectives Recognise uses of electric motors and the energy changes involved. Understand how a motor causes movement Describe the effects of changing the current, field or number of turns in the coil. Understand how a commutator works. Recognise how practical motors are adapted. Recall where motors are found and how they transfer energy. (Grade E-D) Explain how forces on a current carrying coil in a magnetic field are used in a simple d.c. electric motor. (Grade C) Describe the effect of changing: the size of the electric current the number of turns on the coil the strength of the magnetic field. (Grade C) Explain how the direction of force in a motor is maintained by using a split-ring commutator. (Grade C-A) Explain why practical motors have a radial field produced by curved pole pieces. (Grade C-A)

M Faraday? In 3 sentences MHW3

Read Motors at home pg 250 Answer Q5 on white boards

Current-carrying wire in a magnetic field review F = Force B = Magnetic field I = Current S 10/11/2018

Motor (p6e02) – now build your own motor Complete the tasks and answer the questions

Motor – worksheet P6C4 Look at the diagram of a motor. (P6c4) Label and describe the purpose of each of the key parts Permanent magnet Coil Brush Split ring commutator

What effects the size of the force? Can you name the three things that effect the size of the force on the coil in a motor : The strength of the magnetic field The current in the wire The length of the wire (in the field)

Plenary Use 5 words to: Explain how forces on a current carrying coil in a magnetic field are used in a simple d.c. electric motor. Write these on a white board Share them with someone in the class you have not worked with today

Success Criteria Learning Objectives Recognise uses of electric motors and the energy changes involved. Understand how a motor causes movement Describe the effects of changing the current, field or number of turns in the coil. Understand how a commutator works. Recognise how practical motors are adapted. Recall where motors are found and how they transfer energy. (Grade E-D) Explain how forces on a current carrying coil in a magnetic field are used in a simple d.c. electric motor. (Grade C) Describe the effect of changing: the size of the electric current the number of turns on the coil the strength of the magnetic field. (Grade C) Explain how the direction of force in a motor is maintained by using a split-ring commutator. (Grade C-A) Explain why practical motors have a radial field produced by curved pole pieces. (Grade C-A)