1 2 3 4 5 6 7 8 9 10 11 P2.3 Currents in electrical circuits_1 Key Recall Question Answer 1. What happens when insulating materials They become electrically charged. are rubbed against each other? 2. What particle is rubbed off between each Electrons (which have negative charges) insulating material when they are rubbed together? 3. How does one of the insulating materials It gains electrons (from the other insulating material) become negatively charged? 4. How does one of the insulating materials It loses electrons (to the other insulating material) become positively charged? 5. What happens if two electrically charged They exert a force on each other (e.g. a charged balloon objects are brought together? near to charged hair) 6. If two electrically charged materials, which They will repel each other. carry the same charge, are brought near to each other what will happen? 7. If two electrically charged materials, They will attract each other. carry different charges, are brought near to each other what will happen? 8. What sort of materials can electrical Metals (think back to chemistry and their structure to charges move through easily? understand why) 9. What is electric current? The flow of electric charge. 10. What does the size of electric current The rate of flow of electric charge. depend on? 11. How can the size of current be calculated? I = Q/t where I is current in amperes (A), Q is the charge in coulombs (C) and t is the time in seconds (s). Question Date: Date: Date: Date: Date: Date: Date: Date: Date: Date: Date: Date: Date: 1
1 2 3 4 5 6 7 8 9 10 11 P2.3 Currents in electrical circuits_1 Key Recall Question Answer 1. What happens when insulating materials are rubbed against each other? They become electrically charged. 2. What particle is rubbed off between each insulating material when they are rubbed together? Electrons (which have negative charges) 3. How does one of the insulating materials become negatively charged? It gains electrons (from the other insulating material) 4. How does one of the insulating materials become positively charged? It loses electrons (to the other insulating material) 5. What happens if two electrically charged objects are brought together? They exert a force on each other (e.g. a charged balloon near to charged hair) 6. If two electrically charged materials, which carry the same charge, are brought near to each other what will happen? They will repel each other. 7. If two electrically charged materials, carry different charges, are brought near to each other what will happen? They will attract each other. 8. What sort of materials can electrical charges move through easily? Metals (think back to chemistry and their structure to understand why) 9. What is electric current? The flow of electric charge. 10. What does the size of electric current depend on? The rate of flow of electric charge. 11. How can the size of current be calculated? I = Q/t where I is current in amperes (A), Q is the charge in coulombs (C) and t is the time in seconds (s). Question Date: Date: Date: Date: Date: Date: Date: Date: Date: Date: Date: Date: Date: 1
p2_key_recall_questions.docx