PHYSICAL SCIENCES Grade 12 TERM 3 RESOURCE PACK

PHYSICAL SCIENCES Grade 12

TERM 3

RESOURCE

PACK

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Contents

Worksheets

3

Topic 10: Electric Circuits

4

Topic 11: Electrodynamics

17

Topic 12: Optical Phenomena and Properties of Matter

32

Topic 13: Electrochemistry

43

Topic 14: The Chemical Industry

63

Formal Experiment: Electric Circuits

75

Technical Instructions

76

Learner's Worksheet

79

Marking Guidelines

85

Assessments91

Topic 10: Electric Circuits

92

Topic 11: Electrodynamics

108

Topic 12: Optical Phenomena and Properties of Matter

119

Topic 13: Electrochemistry

131

Topic 14: The Chemical Industry

140

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WORKSHEETS

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RESOURCE PACK

TOPIC 10: Electric Circuits

WORKSHEET QUESTIONS

TOTAL: 62 MARKS

1. Learners conduct an investigation to determine the emf and internal resistance (r) of the battery. They set up a circuit as shown in the diagram below and measure the potential difference using the voltmeter for different currents in the circuit.

r

A

V

The results obtained are shown in the graph below.

Graph of potential difference versus current

1,5

Potential difference (V)

1,0

0,5

0

0

0,5

1,0

Current (A)

1.1 Use the graph to determine the emf of the battery.

(1)

1.2 Calculate the gradient of the graph.

(3)

1.3 What physical property is represented by the magnitude of the gradient of the graph?(2)

4Grade 12 Physical Sciences

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WORKSHEETS

TOPIC 10

TOPIC 10: ELECTRIC CIRCUITS

1.4 How does the voltmeter reading change as the ammeter reading increases? Write

down INCREASES, DECREASES or REMAINS UNCHANGED. Use the formula

emf = I(R + r) to explain the answer.

(3)

2. The battery in the following circuit has an emf of 24 V and an internal resistance of 1,5 .

S1

V1

V2

R

A

10

15

S2

R is a resistor with an unknown resistance. The light bulb has a resistance of 15 . The resistance of the switches, S1 and S2 , ammeter and conducting wires can be ignored.

2.1 State Ohm's law in words.

(3)

2.2 What is meant by the internal resistance of the battery?

(2)

2.3 Calculate the effective resistance of the 10 resistor and light bulb.

(3)

When the switch S1 is closed, the bulb converts 576 J of energy per minute.

2.4 Calculate the reading on the voltmeter V2 when the switch is closed.

(4)

2.5 Calculate the reading on the ammeter.

(3)

2.6 Determine the resistance of resistor R.

(4)

2.7 Briefly explain what will happen to the reading on voltmeter V1 when switch S2 is

opened.

(4)

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Term 35

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