Physic's Module

Fizik module adalah  gabungan soalan-soalan exam past year yang merangkumi soalan trial negeri, trial MRSM, trial SBP dan SPM dari tahun 2008 - 2011. Modul ini telah disusun mengikut chapter. Di harapkan pelajar mendapat manfaat daripada modul ini dan mendapat score A Fizik dalam SPM. Berminat sila tinggalkan email pada komen.tq

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QUIZ 2

Factors Affecting Resistance

1. The resistance of a conductor is a measure of the ability of the conductor to (resist / allow) the flow of an electric current through it.
2. From the formula V = IR, the current I is (directly / inversely) proportional to the resistance, R.
3. When the value of the resistance, R is large, the current, I flowing in the conductor is (small / large)
4. What are the factors affecting the resistance of a conductor?

QUIZ 1

1.   5 C of charge flows through a wire in 10 s.  What is the current in the wire?

2.       A charge of 300 C flow through a bulb in every 2 minutes.  What is the electric current in the bulb?

3.       The current in a lamp is 0.2 A.  Calculate the amount of electric charge that passes through the lamp in 1 hour.

Internal resistance (r)

Resistance caused by the difficulty of ion movement in electrolyte

Explaination

In circuit (a) of Fig 1, the switch is open and there is no current through the bulb, but the reading on the voltmeter is 12.1 V. In circuit (b), the switch is closed and there is a current through the bulb. The voltmeter shows the p.d. across the bulb and across the battery. The reading on the voltmeter is now slightly less, at 11.8V. In the first case, the only current is a few microamperes through the voltmeter. This current is negligible compared with the current in the bulb in the second circuit. Why does the voltage decrease? The difference in voltage can be explained by considering the internal resistance of the battery. 

Definition of electromotive force (e.m.f)

i) The work done by a source in driving a unit charge around a complete circuit.
ii) a measurement of the rate at which energy ( joule) is transferred per electric charge (coulomb) from an energy source such as a battery or a dynamo, in the kinetic energy of the moving charge.

e.m.f = Electric energy provided by the source Charge that flow from the source

The unit of e.m.f is JC-1 or volt, V.
1 V = 1JC-1

NOTE 3

An electric field is an area which if entered by a charged object, it will experience the electric force which is produced by a quantity of charge.

The paths of electric field of a positive charge can be represented by the electric force
lines or electric field lines.

The characteristics of the electric field line are:

(i) The lines begin from the positive charge and end at the negative charge.
(ii) The lines do not overlap.
(iii) The lines repel each other.
(iv) The lines intensity represents the electric field intensity.

EXERCISE ELECTRICITY 8

1. Name the device used to measure electrical current. 2. (a) What is the SI unit for current? (b) What is the symbol for the unit of current? 3. How is an ammeter connected in an electrical circuit? 4. The positive terminal of an ammeter is connected to which terminal of the dry cell? 5. What will happen if the positive terminal of the ammeter is connected to the negative terminal of the dry cell?

1. Name the device used to measure potential difference. 2.(a) What is the SI unit for potential difference? (b) What is the symbol for the unit of potential difference? 3. How is an voltmeter connected in an electrical circuit? 4. The positive terminal of a voltmeter is connected to which terminal of the dry cell?

EXERCISE ELECTRICITY 7

        If a current of 0.8 A flows in a wire, how many electrons pass through the wire in one minute?  (Given: The 

charge on an electron is 1.6 x 10^-19C

An electric current of 200 mA flows through a resistor for 3 seconds, what is the 

(a)                electric charge

(b)               the number of electrons which flow through the resistor?

EXERCISE ELECTRICITY 6

    How are electrical charges produced by a Van de Graaff generator?  And what type of charges is usualy

produced on the dome of the generator

  When the motor of the Van de Graaff generator is switched on, it drives the

………………………..

 This causes the rubber belt to against the …….……… and hence becomes …..………

The charge is then carried by the moving belt up to the ……………   ………. where it is collected.

A large amount of ……………. is built up on the dome 

  …………………….  charges are usually produced on the dome of the generator.