# AQA Physics P2.3

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 Author: BMH ID: 298329 Filename: AQA Physics P2.3 Updated: 2015-03-13 14:05:56 Tags: AQA Physics P2 Folders: Description: AQA Physics P2.3 Show Answers:

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1. Are electrons negatively or positively charged?
Negatively
2. What causes some insulating materials to become electrically charged when they are rubbed together?
Electrons are rubbed off one material and onto the other
3. What happens when two electrically charged objects (that have the same charge) are brought together?
They repel each other
4. Give an example of a type of material that electrical charges can move through easily
Metals
5. What is electric current?
A flow of electric charge
6. What is the unit of electrical current?
Ampere (Amp) (A)
7. How is the size of a current (I) calculated from the total charge (Q) and time (t)?
I = Q/t
8. What is the standard unit of electrical charge?
Coulomb (C)
9. What is potential difference another name for ?
Voltage
10. What is this the symbol for?

Switch (open)
11. What is this the symbol for ?
Switch (closed)
12. What is the symbol for a fuse?
13. What is the symbol for a cell ?
14. What is the symbol for a battery ?
15. What is this the symbol for ?
Diode
16. What is this the symbol for ?
Variable resistor
17. What is this the symbol for ?
Resistor
18. What is this the symbol for ?
Light Emitting Diode (LED)
19. What is this the symbol for ?
Light Dependent Resistor (LDR)
20. What is this the symbol for ?
Thermistor
21. What is this the symbol for ?
Lamp
22. What is the symbol for a voltmeter?
23. What is the symbol for an ammeter?
24. What component is this graph for?
Resistor
25. What is the unit of resistance?
Ohm
26. If a component has a larger resistance, will the current be larger or smaller?
Smaller
27. In a series circuit, what do you know about the current at different points?
It is always the same
28. In a series circuit how is the total resistance calculated?
By adding up the individual resistances
29. For components connected in parallel what do you know about the potential difference across each component?
They are all the same
30. What component is this graph for?
Filament bulb
31. Which component only allows current to flow one way?
Diode
32. What component is this graph for?
Diode
33. What happens to the resistance of an LDR as light intensity increases?
The resistance decreases
34. What happens to the resistance of a thermistor as temperature increases?
The resistance decreases
35. Which component emits light when a current flows through it in a forward direction?
Light Emitting Diode (LED)

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