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chapter one Flashcards

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11
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the electrical conductivity of different materials is different

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duo to the concentration of free electrons

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12
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give reasons some materials conduct electricity while others are considered insulators

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good conductor has a high concentration of free electrons like metals while insulators has no free electron like plastic

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13
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give reasons the electrical conductivity of different materials is different

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duto the concentration of the free electrons

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16
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give reasons copper has a high condictivity

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bec it is has a high constrition of free electron

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17
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20
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21
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diff electric sourse

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source of electromotive force to make electric potential defference between the terminal of conductor

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22
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diff wire

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to conduct electrical charges through the closed circuit

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23
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diff key switch

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to switch on or off the circuit

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24
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diff ammeter

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instrument connected in series to measure the elerctric current intensity through the circuit

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25
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dif voltmeter

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instrument connected in parallel between two points to measure the electric potential differennce between this point

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26
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fixed resistance

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it is consumes the electric energy in form of thermal energy

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27
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Rheostat

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to control the total resistance through the whole circuit

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28
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29
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diff potential difference

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it is the work done to transfer a unit of charge between these two points

30
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diff ohms law

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it is the current intensity in a conductor is directly proportional to the potential difference across its terminals at constant temperature

31
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diff couloum

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cc

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35
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check it

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43
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physical quantity , equivlant unit volt / amp J / C-1 amp . sec ohm . m v . m/A ohm -1 . m-1

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C

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46
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a wire of resistance 2 ohm carry 3 amp if the electric current in the same wire is increased to be 6 amp the resistance of the wire be

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same as it

47
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series connection of resistors lead to in the total resistance

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increase

48
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series connection of resistors lead to in the total resistance

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decrease

49
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the lowest equivalent resistance for some resistance is on joining them

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parallel

50
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the greatest equivalent resistance for some resistance is on joining them

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series

51
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when the length of copper wire is doubled and itis cross section decreases to half it is resistance

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g

52
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wire of resistance if its length is doubled and its radius is decreased to half its value sot the resistance

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g

53
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wire of resistance if its length is doubled and its radius is decreased to half its value sot the specific resistance

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g

54
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when the radius of wire increased to double its value while the length decreased 1 / 4 itis value so it is conductivity

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g

55
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cylindral rod of cupper is reformed which its length to 3 times its value then its resistance become its value

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g

56
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a conductor of uniform cross - section it is length 20 m and it is resistance 108 ohm antother conductor of the same matriel itis length 5 m and cross - section area = three times the cross sectinol area of the first . the resistance of the second =

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g

57
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a wire resistance and another of similar material and length but of the diameter 2/3 of the diameter of the first so resistance of the second wire =

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g

58
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a wire resistance and another of half lengthifthe diameter 2nd wire = the radius of the of the first and itis resistivity is 4/3 so resistance of the second wire =

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g

59
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explain an experiment to determine the equivlant resistance of resistors connected in series

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p 22 guide ans

60
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explain an experiment to determine the equivlant resistance of resistors connected in parallel

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p 23 guide ans

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66
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EXPERMENT of ohms law for closed circuit

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p 47

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69
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give reason the potential difference between the terminals of the cell is not the same as its E . M . F

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because work is lost to overcome causes drop in voltage (Ir) so the external voltage is always smaller than E . M . F by the value of ( Ir ) ( V=VB - Ir )

70
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the resistavity of incresing by increacing

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71
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a fuse supports current 1 amp , is placed in a circuit contains a battery of e.m.f , the smallest resister connected in series with the circuit to avoid melting fuse

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R = V / I R = 6 I = V / R = 1 the fuse not melting , elshrt en my3dysh ay current akbr mn elmdhwlk

physics (27 decks)

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