Charge on the move Lesson P2 4.2
Aim: Explain, in terms of the flow of electrons, how and when a metallic ring can be charged.
Key words: Electron, Proton, Flow of charge, Conductor, Earth.
Starter: Students to draw energy transfer diagrams for a torch. This provides a recap of material & knowledge covered in Year 9.
Main: Demonstration and explanations of the flow of charge using a gold leaf electroscope, charged rings and simple circuit model (virtual physics lab).
Students should make some notes explaining that current is the flow of electrical charge.
Students to draw a simple cartoon strip explaining what they observed during the ‘ring charging demonstration’. Particular attention should be given to the movement of electrons. Remember protons do not move, they are trapped in the nucleus of their respective atoms!
H Extension: Explaining lightning. H students should understand that as we supply a conductor with more and more charge, it’s electric potential energy increases. The potential difference between the conductor and the ground also increases. If the p.d becomes high enough then a spark may ‘jump’ between the charged object and a nearby earthed object. This is what happens when lightning strikes clock towers (see back to the future!) etc.
Plenary: Summary questions on Page 227 of the additional Science textbook. AfL self assessment of answers to questions.
Homework: Page 37 of H/W book & Q 16 on page 36.
AQA Specification Link up
· Electrical charges can move easily through some substances, e.g. metals.
· The rate of flow of electrical charge is called the current.
· A charged body can be discharged by connecting it to earth with a conductor, charge then flows through the conductor.
· Greater charge = greater p.d between a body & earth. If the p.d becomes high enough, a spark may jump across the gap between the body and any earthed conductor that is bought near it (HT only).
Aim: Explain, in terms of the flow of electrons, how and when a metallic ring can be charged.
Key words: Electron, Proton, Flow of charge, Conductor, Earth.
Starter: Students to draw energy transfer diagrams for a torch. This provides a recap of material & knowledge covered in Year 9.
Main: Demonstration and explanations of the flow of charge using a gold leaf electroscope, charged rings and simple circuit model (virtual physics lab).
Students should make some notes explaining that current is the flow of electrical charge.
Students to draw a simple cartoon strip explaining what they observed during the ‘ring charging demonstration’. Particular attention should be given to the movement of electrons. Remember protons do not move, they are trapped in the nucleus of their respective atoms!
H Extension: Explaining lightning. H students should understand that as we supply a conductor with more and more charge, it’s electric potential energy increases. The potential difference between the conductor and the ground also increases. If the p.d becomes high enough then a spark may ‘jump’ between the charged object and a nearby earthed object. This is what happens when lightning strikes clock towers (see back to the future!) etc.
Plenary: Summary questions on Page 227 of the additional Science textbook. AfL self assessment of answers to questions.
Homework: Page 37 of H/W book & Q 16 on page 36.
AQA Specification Link up
· Electrical charges can move easily through some substances, e.g. metals.
· The rate of flow of electrical charge is called the current.
· A charged body can be discharged by connecting it to earth with a conductor, charge then flows through the conductor.
· Greater charge = greater p.d between a body & earth. If the p.d becomes high enough, a spark may jump across the gap between the body and any earthed conductor that is bought near it (HT only).
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