Explain how changing the size or Exploring: Make a motor direction of the current affects the Give students motor kits (available magnetic field. from equipment suppliers) and ask Explain how electromagnets are used them to build a simple electric motor in relays. of the ‘Westminster pattern’. Describe how a wire carrying a current must be oriented in a magnetic field to Explaining: Motor effect produce a force. demonstration Describe how the motor effect is used Demonstrate the motor effect in a simple electric motor and how the (sometimes called the ‘catapult force it produces can be changed. effect’). Ask students to suggest what Exceeding will happen if you reverse the Use Fleming’s left-hand rule and the direction of the magnetic field or right-hand grip rule. reverse the direction of the current. Explain how the motor effect is used in unfamiliar devices. Plenary: Thinking about electromagnets Consider All Possibilities: An electromagnet will not pick up a can of food. (Possible answers: the can is made of a non-magnetic material; there is no current flowing through the electromagnet; the electromagnet is not strong enough to pick up the can of food.) Written by Penny Johnson.
Explain how changing the size or direction of the current affects the magnetic field. Explain how electromagnets are used in relays. Describe how a wire carrying a current must be oriented in a magnetic field to produce a force. Describe how the motor effect is used in a simple electric motor and how the force it produces can be changed. Exceeding Use Fleming’s left-hand rule and the right-hand grip rule. Explain how the motor effect is used in unfamiliar devices. Exploring: Make a motor Give students motor kits (available from equipment suppliers) and ask them to build a simple electric motor of the ‘Westminster pattern’. Explaining: Motor effect demonstration Demonstrate the motor effect (sometimes called the ‘catapult effect’). Ask students to suggest what will happen if you reverse the direction of the magnetic field or reverse the direction of the current. Plenary: Thinking about electromagnets Consider All Possibilities: An electromagnet will not pick up a can of food. (Possible answers: the can is made of a non-magnetic material; there is no current flowing through the electromagnet; the electromagnet is not strong enough to pick up the can of food.) Written by Penny Johnson.
Physics2years.docx