Chen builds a circuit to measure the size of the current in different components. He draws a diagram of his circuit. The lamp can be replaced with other components. More than one cell can be connected in the circuit. Component Number of cells used Current in amperes Lamp 1 0 . 6 Resistor 2 1 . 6 20 cm length of resistance wire 1 1 . 0 50 cm length of resistance wire 1 0 . 4 Chen has made a mistake in his diagram. Which component has he left out of his diagram?

From the given table is Chen measured current through various component by connecting them in the circuit individually by connecting respective number of cells as given in the table. While drawing the circuit diagram Chen made a mistake by not keeping ammeter in the circuit. An ammeter should be connected in the series to the component in the circuit to measure the current passing through it.

Chen builds a circuit to measure the size of the current in different components. He draws a diagram of his circuit. The lamp can be replaced with other components. More than one cell can be connected in the circuit. Component Number of cells used Current in amperes Lamp 1 0 . 6 Resistor 2 1 . 6 20 cm length of resistance wire 1 1 . 0 50 cm length of resistance wire 1 0 . 4 Chen cannot write a conclusion based on his results because he has not controlled one of the variables. State which variable is not controlled, and describe what Chen needs to do to make sure he can compare all his results properly.

From the given results in table the current drawn from the circuit is different from one appliance to another. All the appliances have different resistances and the number of cells used also different. Therefore, the given results are not uniform. Keeping the potential difference constant (number of cells used for all appliances is same) we can observe how the current varies with appliance and the resistance of the appliance, similarly the relation between potential difference and current. In another way keeping a known resistance and measuring the current drawn from it corresponding to the number of cells used. It gives the relation between potential difference and current.

Chen builds a circuit to measure the size of the current in different components. He draws a diagram of his circuit. The lamp can be replaced with other components. More than one cell can be connected in the circuit. Component Number of cells used Current in amperes Lamp 1 0 . 6 Resistor 2 1 . 6 20 cm length of resistance wire 1 1 . 0 50 cm length of resistance wire 1 0 . 4 Suggest why the current measured for the 50 cm length of resistance wire is lower than the current for the 20 cm length.

From the given results in table the current drawn from the circuit is different for 50 cm length of resistance and 20 cm . For both the results the number of cells are used same for both the wires. We know that according to ohm's law current I is directly proportional to the potential difference ( V ) . The resistance of the wire is directly proportional to the length of the wire. V ∝ I ⇒ I = V R R ∝ L ( R is the resistance and L is the length of the conductor.

Aiden Gill, Heidi Foxford and, Dorothy Warren Solutions for Chapter: Electrostatics and Electric Currents, Exercise 3: Exercise 3

Author:Aiden Gill, Heidi Foxford & Dorothy Warren

Aiden Gill Science Solutions for Exercise - Aiden Gill, Heidi Foxford and, Dorothy Warren Solutions for Chapter: Electrostatics and Electric Currents, Exercise 3: Exercise 3

Attempt the practice questions on Chapter 9: Electrostatics and Electric Currents, Exercise 3: Exercise 3 with hints and solutions to strengthen your understanding. Cambridge Lower Secondary Science Stage 9: Workbook solutions are prepared by Experienced Embibe Experts.

Questions from Aiden Gill, Heidi Foxford and, Dorothy Warren Solutions for Chapter: Electrostatics and Electric Currents, Exercise 3: Exercise 3 with Hints & Solutions

EASY

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 9 - Electrostatics and Electric Currents>Exercise 3>Q 7

Look at circuit. The component is a light-dependent resistor. Describe what happens when the amount of light falling on the light-dependent resistor changes.

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EASY

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 9 - Electrostatics and Electric Currents>Exercise 3>Q 7

Look at circuit. The component is a light-dependent resistor. Suggest the use for a circuit like this.

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Suggest the use for a circuit like this.

EASY

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 9 - Electrostatics and Electric Currents>Exercise 3>Q 8

Priya builds circuit as shown in the diagram. She finds that the lamps do not shine brightly. Suggest what Priya could add to the circuit to increase the current and make the lamps shine more brightly.

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EASY

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 9 - Electrostatics and Electric Currents>Exercise 3>Q 8

Priya builds circuit as shown in the diagram. She finds that the lamps do not shine brightly. Use your knowledge of energy and energy transfers to explain why the lamps will shine more brightly when this component is added.

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EASY

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 9 - Electrostatics and Electric Currents>Exercise 3>Q 9

Chen builds a circuit to measure the size of the current in different components. He draws a diagram of his circuit. The lamp can be replaced with other components. More than one cell can be connected in the circuit.

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Component	Number of cells used	Current in amperes
Lamp	$1$	$0.6$
Resistor	$2$	$1.6$
$20 cm$ length of resistance wire	$1$	$1.0$
$50 cm$ length of resistance wire	$1$	$0.4$

Chen has made a mistake in his diagram. Which component has he left out of his diagram?

EASY

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 9 - Electrostatics and Electric Currents>Exercise 3>Q 9

Chen builds a circuit to measure the size of the current in different components. Here is a copy of the diagram. Add the missing component to the circuit.

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EASY

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 9 - Electrostatics and Electric Currents>Exercise 3>Q 9

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Component	Number of cells used	Current in amperes
Lamp	$1$	$0.6$
Resistor	$2$	$1.6$
$20 cm$ length of resistance wire	$1$	$1.0$
$50 cm$ length of resistance wire	$1$	$0.4$

Chen cannot write a conclusion based on his results because he has not controlled one of the variables. State which variable is not controlled, and describe what Chen needs to do to make sure he can compare all his results properly.

MEDIUM

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Workbook>Chapter 9 - Electrostatics and Electric Currents>Exercise 3>Q 9

Question Image

Component	Number of cells used	Current in amperes
Lamp	$1$	$0.6$
Resistor	$2$	$1.6$
$20 cm$ length of resistance wire	$1$	$1.0$
$50 cm$ length of resistance wire	$1$	$0.4$

Suggest why the current measured for the $50 cm$ length of resistance wire is lower than the current for the $20 cm$ length.

Aiden Gill, Heidi Foxford and, Dorothy Warren Solutions for Chapter: Electrostatics and Electric Currents, Exercise 3: Exercise 3

Aiden Gill Science Solutions for Exercise - Aiden Gill, Heidi Foxford and, Dorothy Warren Solutions for Chapter: Electrostatics and Electric Currents, Exercise 3: Exercise 3

Questions from Aiden Gill, Heidi Foxford and, Dorothy Warren Solutions for Chapter: Electrostatics and Electric Currents, Exercise 3: Exercise 3 with Hints & Solutions

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