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ELECTRICITY MODULE USING PHET SIMULATION

SITI AIZZAH BINTI MOHAMMAD ASARI

Created on December 17, 2021

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Transcript

ELECTRICITY MODULE

USING PHET SIMULATION

CONTENTS

LEARNING STANDARDS

INTRODUCTION

NOTES

COMPONENTS

PhET SIMULATION USER MANUAL

ACTIVITY ZONE

EXERCISE TIME

CONCEPT MAP

SELF-REFLECTION

LEARNING STANDARDS

7.1.5 Characterize current, voltage and resistance and their units. 7.1.6 Summarize the relationship between current, voltage and resistance. 7.2.1 Describe and communicate about the flow of electric current in series circuits and parallel circuits

INTRODUCTION

This interactive learning module is made for the use of teachers and Level 2 Science students in understanding Chapter 7 Electricty more better. Now learning Electricity is expected to be easier and not limited in the laboratory only. It can also be learned online and fun to explore.

NOTES

OHM'S LAW

V = IR Ohm's Law states that the electrical current flowing through a conductor is directly proportionate to the voltage across the two end of the conductor provided that the temperature and other physical conditions are fixed.

The triangle formula can be used to memorize Ohm's Law. Put your finger on the value you are looking for. Then multiply or divide the two given value.

I = V/R

R = V/I

V = I X R

NOTES

CHECK OUT THIS VIDEO TOO CLICK HERE

Credit video to Knowledge Platform

COMPONENTS

A complete electric current is made up of various electrical components such as:

Battery

Supply energy to the circuit by doing work upon the charge to move it from the low energy terminal to the high energy terminal.

Resistor

Reduces the electric current. Measured in units of ohms (symbol: Ω).

Bulb

Converts electrical energy to light. When electric current flows through it, the bulb produces light.

Switch

Control the flow of electrical current within a circuit. It can be used to both inhibit the flow of the current or to initiate it.

COMPONENTS

Ammeter

Measuring the flow of electric current

Galvanometer

Detect or measure the presence of a small amount of current flowing in a circuit.

Voltmeter

Measuring electric potential difference between two points in an electric circuit. It is connected in parallel. Measured in units of voltage (symbol: V).

PhET SIMULATION USER MANUAL

1. Search "PhET Simulation" in your search engine.

PhET SIMULATION

2. Scroll down and choose Physics subject.

3. Filter the topic that we will focus. Tick only Electricity, Magnets & Circuits

PhET SIMULATION USER MANUAL

4. Choose Circuit Construction Kit: DC - Virtual Lab

5. This is the display for running your activity / experiment

6. READY TO EXPLORE!

PhET SIMULATION USER MANUAL

Button to take note:

NOW LET US DO SOME ACTIVITIES

ACTIVITY ZONE

ACTIVITY 1

Try to build a simple circuit using PhET Simulation. That is a series circuit and a parallel circuit and record your observation. Aim: To give early exposure to students in building circuits using PhET simulation Apparatus: Switch 3 bulbs Battery (15V)

Figure 1.1: Series Circuit Figure 1.2: Parallel Circuit

Questions: 1. Which bulb is more brighter? 2. Why does the bulb in _______ circuit is more brighter?

ACTIVITY ZONE

ACTIVITY 1

Answers:

1. Which bulb is more brighter? 2. Why does the bulb in _______ circuit is more brighter?

1. Bulb in Parallel Circuit is more brighter than bulb in Series Circuit2. Because in a series circuit, the voltage is equally distributed among all of the bulbs. In a parallel circuit the voltage for each bulb is the same as the voltage in the circuit.

ACTIVITY ZONE

ACTIVITY 2

By using PhET Simulation buid a circuit to measure the current and voltage using suitable measuring apparatus. Apparatus: Ammeter, Voltmeter,connecting wire, switch, dry cell and bulb.

Figure 2.1

A. Measuring current using an ammeter Instruction 1. Connect the circuit as shown in Figure 1.2 using one dry cell. 2. Turn on the switch and record the reading of the ammeter. Observe the brightness of the bulb. Record your observations. 4. Repeat step 1 to 3 using two dry cells.

ACTIVITY ZONE

B. Measuring voltage using an voltmeter Instruction 1. Connect the circuit as shown in Figure 1.3 using one dry cell. 2. Turn on the switch and record the reading of the ammeter. Observe the brightness of the bulb. Record your observations. 4. Repeat step 1 to 3 using two dry cells.

Figure 2.2

Observation

Reading of ammeter / A

ACTIVITY ZONE

Questions 1. What is the relationship between the electrical current and the increase in the number of dry cells? 2. What is the relationship between the voltage and the increase in the number of dry cells? 3. Give an inference for the brightness of bulb in Activity A. 4. What is the relationship between the voltage, electric current and the brightness of the bulb?

Reading of ammeter / A

ACTIVITY ZONE

Answers:

Figure 2.4: Activity A with 2 dry cell

Figure 2.3: Activity A with 1 dry cell

Figure 2.6: Activity B with 2 dry cell

Figure 2.5: Activity B with 1 dry cell

Result of the observation

ACTIVITY ZONE

Answers: 1. What is the relationship between the electrical current and the increase in the number of dry cells? When the number of dry cells increase, the current increases. 2. What is the relationship between the voltage and the increase in the number of dry cells? When the number of dry cells increase, the voltage increases. 3. Give an inference for the brightness of bulb in Activity A. The brightness of the bulb increases because of the current in the circuit increases. 4. What is the relationship between the voltage, electric current and the brightness of the bulb? When the voltage inceases, the current increases and the brightness of the bulb increases.

Reading of ammeter / A

ACTIVITY ZONE

ACTIVITY 3

Aim: To study current, voltage and resistance in a series circuit. Apparatus: Bulb (1.5V), Wire. Dry Cell, Switch, Ammeter and Voltmeter

Instruction: 1. Set up a series circuit as shown in Figure 3.1 (a). 2. Turn on the switch and measure the current that flows through bulb M. Measure the current that flows through bulb N by placing the ammeter between M and N as shown in Figure 3.1 (b). 3. Measure the current that flows through bulb M and N by setting up the circuit as shown in Figure 3.1 (c). 4. Set up the voltmeter across the bulb M, followed by bulb N as shown in Figure 3.1 (d) to measure the voltage reading across the bulb.

Figure 3.1

ACTIVITY ZONE

ACTIVITY 3

5. Set up the voltmeter as shown in Figure 3.1 (e) to measure the voltage across two bulb. 6. Calculate the resistance for each bulb separately and also for both the bulbs using Ohm's Law. 7. Record all the readings in a table.

Figure 3.1

Questions 1. What is your conclusion on the current flow through the series circuit? 2. What will happen to the bulbs in the series circuit if one of the bulbs is removed?

ACTIVITY ZONE

ACTIVITY 3

Questions: 1. What is your conclusion on the current flow through the series circuit? 2. What will happen to the bulbs in the series circuit if one of the bulbs is removed?

Answers: 1. The current that flows through every point is the same. 2. The other bulb does not light up. When one bulb is removed, the circuit is broken.

ACTIVITY ZONE

Current, Voltage and Resistance in Series Circuit can be concluded as:

Table 3.1: Advantages and Disadvantages of a Series Circuit

ACTIVITY ZONE

ACTIVITY 4

Aim: To study current, voltage and resistance in a parallel circuit. Apparatus: Bulb (1.5V), Wire. Dry Cell, Switch, Ammeter and Voltmeter

Instruction: 1. Set up a parallel circuit as shown in Figure 4.1 (a). 2. Turn on the switch and measure the current that flows through bulb M. Measure the current that flows through bulb N by changing the position of the ammeter. 3. Measure the current that flows through both the bulbs, M and N by setting up the circuit as shown in Figure 4.1 (b). 4. Fix the voltmeter across bulb M followed by bulb N as shown in Figure 4.1 (c) to measure the voltage across the bulb.

Figure 4.1

ACTIVITY ZONE

ACTIVITY 4

5. Fix the voltmeter as shown in Figure 4.1 (d) to measure the voltage across two bulbs. 6. Calculate the resistance for each bulb separately and also for both the bulbs using Ohm's Law. 7. Record all the readings in a table.

Figure 4.1

Questions: 1. Is the value of voltage different for bulb M and N? 2. List out the advantage and disadvantages of a parallel circuit.

ACTIVITY ZONE

ACTIVITY 4

Questions: 1. Is the value of voltage different for bulb M and N? 2. List out the advantage and disadvantages of a parallel circuit?

Answers: 1. The voltage of bulb M and N are the same because the voltage in the parallel circuit is the same. 2. The advantage of a parallel circuit - Each device can be controlled by its own switch. - The damage in one device does not interrupt the function of another device. The disadvantages of a parallel circuit - The voltage in each device cannot be controlled.

ACTIVITY ZONE

Current, Voltage and Resistance in Parallel Circuit can be concluded as:

Table 4.1: Advantages and Disadvantages of a Parallel Circuit

ACTIVITY ZONE

ACTIVITY 5

Solve numerical problem related to current, voltage and resistance in series circuit and parallel circuit.

Questions: 1. Based on Figure 1, calculate: a) the effective resistance b) the current in the circuit c) the voltage across each resistor

Figure 5.1

ACTIVITY ZONE

ACTIVITY 5

Solve numerical problem related to current, voltage and resistance in series circuit and parallel circuit.

Questions: 2. Based on Figure 2, calculate: a) the effective resistance b) the current in the circuit c) the voltage across each resistor

Figure 5.2

ACTIVITY ZONE

ACTIVITY 5 :

Answers: 1.

ACTIVITY ZONE

ACTIVITY 5 :

Answers: 2.

Electrical wiring at home Electrical wiring system in our homes is connected in parallel. For example, all the lights gets the same voltage from its main power supply. The current that flows from the main power supply to the circuit is controlled by a distribution panel. (Figure 1)

Figure 6: Distribution panel

exercise time

1. Solve the crossword puzzle using the question given below

Answer:

a. Ammeter is used to measure ________ in the circuit. While Voltmeter is used to measure ________ in the circuit. b. _______ is the unit for electric current, _______ is the unit for resistance and ________ is the unit for voltage. c. Energy is measured in the unit ________. d. Diagram above shown is a complete series circuit. The resistance for X is _______ ohm.

Figure 7

exercise time

ANSWER

Answer:

a. Ammeter is used to measure current in the circuit. While Voltmeter is used to measure voltage in the circuit. b. Ampere is the unit for electric current, ohm is the unit for resistance and volt is the unit for voltage. c. Energy is measured in the unit Joule. d. Diagram above shown is a complete series circuit. The resistance for X is four ohm.

exercise time

2. Solve the crossword puzzle below:

ACROSS c) ________ resists the electric current from flowing through a conductor. d) A circuit connected in ______ has the same current across the bulb.

DOWN a) ________ allows the electric current to flow through it. b) A circuit connected in ______ has the same voltage across the bulb.

exercise time

ANSWER

ACROSS c) Resistor resists the electric current from flowing through a conductor. d) A circuit connected in series has the same current across the bulb.

DOWN a) Conductor allows the electric current to flow through it. b) A circuit connected in parallel has the same voltage across the bulb.

exercise time

3. The following diagram shows an electrical circuit. What is the total resistance on the circuit

4. The following diagram shows an electrical circuit. What is the total resistance on the circuit

exercise time

3. The following figure shows an electrical circuit. What is the total resistance on the circuit Answer:

Figure 8

4. The following figure shows an electrical circuit. What is the total resistance on the circuit Answer:

Figure 9

CONCEPT MAP

ELECTRICITY AND MAGNETISM

V = V + V

I = I = I

R = R + R

1 2

ELECTRIC CIRCUIT

SERIES CIRCUIT

PARALLEL CIRCUIT

OHM'S LAW

V = IR

V = V = V

I = I + I

R R R

1 2

1 2

1 2

1 2

1 2

1 1 1

= +

SELF REFLECTion

New things I have learnt in this subtopic are: The most interesting things I have learnt in this subtopic is ________. The least thing that I understand is ______ and I need to improve myself.

Characterize current, voltage and resistance and their units. Draw a conclusion on the relationship between current, voltage and resistance. Elaborate and communicate about the flow of electric current in series and parallel circuit.

THE END

Prepared by: Siti Aizzah binti Mohammad Asari Supervisor: Dr Omar Ayad Fadhil Al-Zuhairi