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physics form 5
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   Physics Module Form 5 Chapter 7: Electricity CHAPTER 7: ELECTRICITY 7.1 CHARGE AND ELECTRIC CURRENTVan de Graaf  1 . What is a Van de Graaff generator? Fill in each of the boxes the name of the part shown.A device that ……………….. and ………………….. at high voltage on its dome2.ow are electrical charges prod!ced b a Van de Graaff generator? And what t peof charges is !s!all prod!ced on the dome of the generator?  When the motor of the Van de Graaff generator is switched on# it drives the ………………………..  $his ca!ses the r!bber belt to against the …….………  and hence becomes …..………  $he charge is then carried b the moving belt !p to the …………… ……….where it is collected.  A large amo!nt of ……………. is b!ilt !p on the dome  ……………………. charges are !s!all prod!ced on the dome of the generator  . %.What will happen if the charged domeof the Van de Graaff is connected to theearth via a micrometer? &xplain.  $here is a ……………………..  of the pointer of the microammeter. ' 1 ' dome   +++++++++++++++++   Physics Module Form 5 Chapter 7: Electricity  $his indicates an electric c!rrent ……………………. (.)redict what will happen if adischarging metal sphere to the chargeddome.  When the discharging metal sphere is bro!ght near the charged dome#…………………………… occ!rs.  An electric c!rrent …………… *. )redict what will happen if hair of ast!dent is bro!ght near to the chargeddome. Give reasons for o!r answer.  $he metal dome …………. the hair and the hair stand ………………. .    $his is beca!se of each strand of hair receives ……………….. charges and…………………….. each other.+. $he flow of electrical charges prod!ces …………………. Electric Crrent 1.&lectric c!rrent consists of a flow of …………......2.$he more charges that flow thro!gh a cross section within a given time# the ………………is the c!rrent.%. Electric crrent  is defined as the rate of flow of ………………………….(. ,n s mbols# it is given as-' 2 ' &ach second# 1* co!lombs of charge cross the plane. $he c!rrent is ,  15  amperes. /ne ampere is one  co!lomb per second. +++++++   Physics Module Form 5 Chapter 7: Electricity where I   …………………….… Q   …………………….…  t   ………….....................0i$he , !nit of charge is 0Ampere 3   4o!lomb   3 Volt0ii$he , !nit of time is 0min!te 3 second 3 ho!r !iii $he , !nit of c!rrent is 0Ampere  # 4o!lomb 3 Volt is e5!ivalent to 04s 33 4 '1 s 33 4s '1  !i$ 6 rearranging the above form!la# 7  0  It   # t  I   #  I t    (.,f one co!lomb of charge flows past in one second# then the c!rrent is ………………….ampere.*.1* amperes means in ………………second# …………….. co!lomb of charge thro!gh a cross section of a cond!ctor.+.,n a metal wire# the charges are carried b ………………….8.&ach electron carries a charge of ………………………..9.1 4 of charge is…………………………….. Electric %ield aAn electric field  is a ………………. in which an……………… experiencesa………….. bAn electric field can be represented b a n!mber of lines indicate boththe……………. and ……………….. of the fieldc$he principles involved in drawing electric field lines are - !i electric field lines alwa s extend from a ……………… ' chargedob:ect to a   ………………..'charged   ob:ect 0iielectric field lines never ………………….. each other# !ii electric field lines are ……………….. in a …………………..electric field.' % ' I  =   Physics Module Form 5 Chapter 7: Electricity De&': T' (td) t*e electric field and t*e effect( 'f an electric field. Apparat!s ; materials&xtra high tension 0&..$ power s!ppl 0< = * >V# petri dish# electrodes with different shapes 0pointed electrode and plane electrode# two metal plates# talc!m powder# coo>ing oil#  pol st rene ball coated with cond!cting paint# thread and candle.ethod DE, A1.et !p the apparat!s as shown in the above fig!re2.witch on the &..$. power s!ppl and ad:!st the voltage to ( >V%./bserved the pattern formed b the talc!m powder for different t pes of electrodes. -.Dra t*e /attern 'f t*e electric field line(.  @raw the pattern of the electric field lines. ELECTRIC %IELD AR,UND A P,0ITIVE CHARGE ' ( '
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