MODUL ELECTRICITY 2019 - alinaimanarif.files.wordpress.com · CHAPTER: ELECTRICITY PHYSICS IS FUN@MRSM TUN GHAFAR BABA 3 STRUCTURE TRIAL PAHANG SET A 2014 1. Diagram 4.1 shows a polystyrene

Topic:

ELECTRICITY

NAME : ……………………………………………. CLASS : ……………………………………………. TEACHER’S NAME : …………………………………………….

The best and most beautiful things in the world

cannot be seen or even touched-they must be felt with the heart.

Helen Keller

CHAPTER: ELECTRICITY

PHYSICS IS FUN@MRSM TUN GHAFAR BABA 2

Checklist:

NO. QUESTION SUBTOPIC/REMARK STRUCTURE

1 TRIAL PAHANG SET A 2014 (NO.4) ELECTRIC FIELD 2 TRIAL TERENGGANU 2014 (NO.3) SERIES &PARALLEL 3 TRIAL KELANTAN 2014 (NO.8) ELECTRICAL ENERGY 4 TRIAL SBP 2018 (NO.6) EMF 5 EDITED QUESTION 2015 (NO.4) OHM’S LAW & ELECTRICAL

ENERGY

UNDERSTANDING QUESTIONS (4 and 5 marks) 1 TRIAL SBP 2007 WIRE LIFE, NEUTRAL 2 TRIAL MELAKA2008 FACTOR AFFECT RESISTANCE 3 TRIAL SBP 2008 OHM’S LAW 4 TRIAL MELAKA 2009 RHEOSTAT 5 TRIAL TERENGGANU 2009 ELECTRIC FIELD 6 TRIAL KELANTAN 2010 2-PIN PLUG & 3-PIN PLUG 7 TRIAL PAHANG 2010 PARALLEL CIRCUIT 8 TRIAL SBP 2014 EMF + SERIES + PARALLEL 9 TRIAL MRSM 2016 EMF

10 TRIAL GERIK 2018 FACTOR AFFECT RESISTANCE

FULL FORMAT ESSAY 1 TRIAL KEDAH 2016 SECTION B 2 TRIAL MSAB 2016 3 SPM 2009 SECTION C 4 SPM 2010



STRUCTURE TRIAL PAHANG SET A 2014

1. Diagram 4.1 shows a polystyrene ball that coated with metallic paint is hung in an electric field between two metal plates.

Diagram 4.1

(a) (i) What is the meaning of electric field?

………………………………………………………………………………….............

[1 mark]

(ii) State the change on the strength of the magnetic field when the potential difference of the high voltage supply increases. ………………………………………………………………………………….............

[1 mark]

(b) The polystyrene ball then is touched to the negative plate. (i) State the type of charge received by the polystyrene ball.

………………………………………………………………………………….............

[1 mark]

(ii) What happen to the polystyrene ball when it is released from negative plate? ………………………………………………………………………………….............

[1 mark]



(c) (i) The polystyrene ball in Diagram 4.1 is replaced by a burning candle. On Diagram 4.2, draw the shape of the candle flame observed in the electric field.

Diagram 4.2

[1 mark]

(ii) Explain why the shape of the candle flame observed as drawn in answer 4(c)(i).

…………………………………………………………………………………………

…………………………………………………………………………………………

[2 marks]

TOTAL 7 MARKS



TRIAL TERENGGANU 2014

2. Diagram 3 shows an electrical circuit. The bulbs P, Q, R and S are identical and the filaments of each bulb has resistance 2 Ω.

Diagram 3

(a) What is the meaning of resistance? …………………………………………………………………………………........................

[1 mark]

(b) When the switch is on, (i) Which two bulbs light up brighter?

…………………………………………………………………………………............. [1 mark]

(ii) Give one reason for the answer in (b)(i).

…………………………………………………………………………………............. [1 mark]

(ii) Calculate the reading of the ammeter.

[3 marks]

TOTAL 6 MARKS



TRIAL KELANTAN 2014

3. Diagram 8 shows a toaster with specification of 240 V, 1000 W.

Diagram 8

(a) What is meant by the label “240V, 1000 W ” on the toaster?

…………………………………………………………………………………........................

[1 mark]

(b) Based on Diagram 8, calculate (i) current flowing through the toaster

[2 marks]

(ii) resistance of the heater of the toaster

[2 marks]

(c) Table 8.1 shows three different types of heater to be used in toaster in Diagram 8 above.

Heater Power supplied to the toaster Power produced (heat)

P 450 Js-1 430 Js-1 Q 550 Js-1 525 Js-1 R 600 Js-1 575 Js-1

Table 8.1



(i) State the effect of thickness of heater to the rate of energy loss in the heater. ………………………………………………………………………………….............

[1 mark]

(ii) Calculate the efficiency of each heaters P,Q, and R.

[4 marks]

(iii) Suggest the most suitable heater to be used in the toaster. Justify your choice. …………………………………………………………………………………………

…………………………………………………………………………………………

[2 marks]

TOTAL 12 MARKS



TRIAL SBP 2018

4. Diagram 6.1 shows a circuit containing a bulb connected in series to six identical dry ells with each e.m.f. 1.5 V.

Diagram 6.1 Diagram 6.2

(a) What is the meaning of electromotive force, e.m.f.? …………………………………………………………………………………........................

[1 mark]

(b) Observe on Diagram 6.1 and Diagram 6.2. (i) Compare the brightness of bulb.

………………………………………………………………………………….............

[1 mark]

(ii) Compare the total of e.m.f. for the dry cells connected in the circuit ………………………………………………………………………………….............

[1 mark]

(ii) Compare the total internal resistance of the dry cells. ………………………………………………………………………………….............

[1 mark]

(c) Based on the answer in 6 (b), relate the total internal resistance with : (i) the brightness of bulb

………………………………………………………………………………….............

[1 mark]



(ii) current flow ………………………………………………………………………………….............

[1 mark]

(d) Diagram 6.3 shows a 12 V accumulator with internal resistance, r = 0.01 W. The accumulator is used to switch on the engine of a car.

Diagram 6.3

Explain why the car engine cannot be switched on when the accumulator is replaced with eight dry cells of 1.5 V with internal resistance, r = 0.5 W each. …………………………………………………………………………………………………

…………………………………………………………………………………………………

[2 marks]

TOTAL 8 MARKS



EDITED QUESTION 2015

5. A student carries out an experiment to investigate the relationship between potential difference, V and current I, across a wire. Diagram 8.1 shows the graph obtained from the experiment.

Diagram 8.1

(a) (i) State the relationship between potential difference, V and current I.

…………………………………………………………………………………............. [1 mark]

(ii) State the law involved.

…………………………………………………………………………………............. [1 mark]

(b) Diagram 8.2 shows a circuit consists of electrical appliances.

Diagram 8.2



Table 8.3 shows the power rating and energy consumption per day of the electrical appliances shown in Diagram 8.2.

Appliance Power rating (W) Time of usage per day Lamp 60 10 hours

Laptop 50 6 hours Electric Iron 2000 3 hours Refrigerator 400 24 hours

Table 8.3

(i) Calculate total energy consumed in one day.

[3 marks]

(ii) If the electricity cost is RM 0.218 per kWh, calculate the total cost for one month.

[3 marks]

TOTAL 8 MARKS



UNDERSTANDING & CONCEPT 1.

SBP 2007

Explain why it is more dangerous to touch the live wire of a mains supply, rather than the neutral wire.

[4 marks]

2.

MELAKA 2008

Diagram 11.1 shows a graph of potential difference against current for two materials, Y and Z. One of the materials will be chosen as filament in a bulb.

Diagram 11.1

Based on the graph in Diagram11.1, compare the resistance of materials Y and Z. Choose the more suitable material to use as a filament of the bulb. Explain your choice.

[4 marks]

3.

SBP 2008

Explain why the bulb connected to two dry cells lights up brighter than one bulb connected to one dry cell. Explain.

[4 marks]



4.

MELAKA 2009

Diagram 11.1 shows a rheostat. Rheostat is a common device used in the laboratory.

Diagram 11.1

Explain the working principle of the rheostat.

[4 marks]

5.

T’GANU 2009

Diagram 12.1 shows a ping pong ball coated with thin metal foil placed between a pair of parallel metal disc. When the E.H.T is switched on, an electric field is formed in between the metal disc.

Diagram 12.1

Explain what will happen to the ping pong ball when it is brought to touch the metal disc connected to positive terminal of EHT?

[4 marks]



6.

KELANTAN 2010

Diagram 10.5 shows two types of plug for the electric kettle that can be connected to the electric supply. Diagram 10.5(a) uses two pin plug, while Diagram 10.5(b) uses a three pin plug with an earth wire.

Diagram 10.5

Explain why a three pin plug is more suitable compared with a two pin plug.

[4 marks]

7.

PAHANG 2010

Explain the advantages of parallel circuit in a house wiring system. [4 marks]

8.

SBP 2014

Batteries with internal resistance connected in series and in parallel as shown in Diagram 10.3 will affect the brightness of the bulbs. Explain why.

Diagram 10.3

[4 marks]



9.

MRSM 2016

Diagram 12.1 shows a new packet of batteries with information about its characteristics.

Diagram 12.1

With the aid of a circuit diagram and a graph, explain how internal resistance of a battery can be determined.

[4 marks]

10.

GERIK 2018

Diagram 12.3 shows the graph of the relationship between the potential difference and the current of a constantan wire and a filament bulb.

Diagram 12.3

Describe the graph of the potential difference graph against current for constantan wire and filament bulb. In your description, explain in terms of resistance and temperature.

[4 marks]



SECTION B TRIAL KEDAH 2016

1. Diagram 10.1 and Diagram 10.2 show a circuit where a wire PQ and RS is respectively connected parallel to a voltmeter.

Diagram 10.1

Diagram 10.2

Wire PQ and wire RS are made of the same material and have the same length. The cross- sectional area of wire PQ is 3.2 x 10-3 cm2 and the cross-sectional area of wire RS is 4.0 x 10-3 cm2.

(a) Name the physical quantity that is measured by the ammeter. [1 mark]

(b) Using Diagram 10.1 and Diagram 10.2, (i) compare the ammeter reading, the cross-sectional area and the resistance of wires.

[3 marks]

(ii) state the relationship between the ammeter reading with the cross-sectional area of

the wire, and the cross-sectional area with the resistance of the wire. [2 marks]



(c) Diagram 10.3 shows a ping pong ball coated with metallic paint and suspended on nylon thread between the metal plates X and Y. Plate X is connected to the dome of a Van de Graaff generator and plate Y is connected to earth through a microammeter.

Diagram 10.3

Explain why the ping pong ball swings when the Van de Graaff generator is switched on.

[5 marks]

(d) Diagram 10.4 shows a USB power bank which is normally used to recharge a handphone when its battery runs low.

Diagram 10.4

You are required to modify the power bank in Diagram 10.4 so that the recharging of the handphone is more efficient and convenient to bring along. State and explain the modifications based on the following aspects:

(i) the density of the power bank (ii) the capacity of electric charge of the power bank in unit milliAmpere-hour (mAh) (iii) the charging time (iv) the rate of power loss (v) the number of USB port [10 marks]

TOTAL 20 MARKS



TRIAL MSAB 2016

2. Diagram 10.1 shows a polystyrene ball coated with conducting material placed between two metal plates, X and Y.

Diagram 10.1 The metal plates are connected to an Extra High Tension, E.H.T., supply which produces a strong electric field between X and Y when the switch is on.

(a) (i) What is the meaning of electric field? [1 mark]

(ii) What happens to the polystyrene ball when the switch is turned on and the

polystyrene ball is pushed toward metal plate X? Explain your answer.

[4 marks]

(b) Diagram 10.2 shows a circuit with a dimmer bulb and the ammeter reading. Diagram 10.3 shows a circuit with brighter bulb and the ammeter reading.

Diagram 10.2



Diagram 10.3

Based on Diagram 10.2 and Diagram 10.3, compare the voltage supply, current and effective resistance of the circuit. Relate the current with effective resistance of the circuit to make a deduction on the relationship between the current of the circuit and brightness of the bulb.

[5 marks]

(d) Diagram 10.4 shows an electric kettle.

Diagram 10.4

Using appropriate physics concepts, explain the use of suitable equipment to design an electric kettle which can boil the water faster and safe to use. Your answer may include aspects like resistivity of immersion heater, specific heat capacity of the kettle body and others.

[10 marks]

TOTAL 20 MARKS



SECTION C SPM 2009

1. A potential difference of 240 V from the main power supply is applied to a filament lamp. The lamp lights up with normal brightness.

(a) What is the meaning of potential difference? [1 mark]

(b) Diagram 12.1 shows a graph of potential difference, V, against, I, for a filament lamp.

Diagram 12.1

(i) Based on the graph, state a relationship between V and I.

What can you conclude about the resistance of the lamp? Give one reason for you answer.

[3 marks]

(ii) What happens to the energy dissipated in the filament lamp when the current flowing is decreased?

[1 mark]

(c) Diagram 12.2 shows an energy saving bulb. When it is connected to a 240 V power supply, the bulb produces 11 joules per second of light energy.

Diagram 12.2



Calculate (i) the current flows through the bulb. (ii) the heat energy lost in 1 second from the bulb (iii) the efficiency of the bulb [5 marks]

(d) You are asked to investigate the design and the characteristics of five filament lamps shown

in Diagram 12.3. Explain the suitability of each characteristics of the lamps and determine the lamp which can produce the brightest light. Give reasons for your choice.

[10 marks]

P

Q

R

S

T

Diagram 12.3

TOTAL 20 MARKS



SPM 2010

2. Diagram 12.1 shows a candle flame placed between two metal plates, P and Q.

Diagram 12.1

The metal plates are connected to an Extra High Tension, E.H.T., supply which produces a strong electric field between P and Q when the switch is on.

(a) (i) What is the meaning of electric field? [1 mark]

(ii) What happens to the candle flame when the switch is on?

Explain your answer. [4 marks]

(b) Diagram 12.2 shows an electric circuit.

Diagram 12.2



The e.m.f. of the cell is 2.0 V and its internal resistance is 1.0 Ω. Calculate the reading of the ammeter when

(i) only switch S1 is on [2 marks]

(ii) both switches, S1 and S2, are on. [3 marks]

(c) Diagram 12.3 shows four circuits, W, X, Y and Z, containing three dry cells of

electromotive force, e.m.f., 1.5 V each, two bulbs labelled 2 V, 0.5 W and resistor R.

Circuit W

Circuit X

Circuit Y

Circuit Z

Diagram 12.3



You are required to determine the most suitable circuit that can be used to light up the bulbs with normal brightness. You may need to do some calculations. Study the specification of all the four circuits based on the following aspects:

(i) The type of connection of the cells. (ii) The connection of the terminals of the cells. (iii) The connection between the resistor and the bulbs. (iv) The type of connection of the bulbs.

Explain the suitability of each aspect and then determine the most suitable circuit. Given a reason for your choice.

[10 marks]

TOTAL 20 MARKS

Awesome physics is around you!

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MODUL ELECTRICITY 2019 - alinaimanarif.files.wordpress.com · CHAPTER: ELECTRICITY PHYSICS IS FUN@MRSM TUN GHAFAR BABA 3 STRUCTURE TRIAL PAHANG SET A 2014 1. Diagram 4.1 shows a polystyrene