Year 9 Physics - Basic Electricity
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Questions and Answers

What is the main purpose of keeping wires in straight lines in a circuit diagram?

  • To enhance conductivity
  • To improve visibility of connections (correct)
  • To make the diagram look neat
  • To prevent overheating

Which of the following materials acts as a conductor in a simple circuit?

  • Glass rod
  • Polythene rod
  • Wood
  • Copper wire (correct)

What happens when the circuit is complete and the switch is pressed?

  • The bulb will definitely light up (correct)
  • The bulb may or may not light up
  • The bulb will always remain off
  • The bulb will produce a flickering effect

Which statement is true regarding conductors and insulators as described?

<p>Metals contain free electrons to conduct electricity (C)</p> Signup and view all the answers

What is the exception to the rule about non-metals being insulators?

<p>Graphite (D)</p> Signup and view all the answers

In a circuit, what is required for the bulb to light up?

<p>A complete circuit with a source of power (B)</p> Signup and view all the answers

Which method is NOT recommended when drawing a circuit diagram?

<p>Allowing wires to cross each other (D)</p> Signup and view all the answers

What is the characteristic of materials classified as insulators?

<p>They block the flow of electric current (A)</p> Signup and view all the answers

What is one advantage of an electromagnet compared to a permanent magnet?

<p>They can be turned on and off. (D)</p> Signup and view all the answers

What role does the current play in an electromagnet?

<p>It strengthens the magnetic field created. (B)</p> Signup and view all the answers

Which of the following is a common application of electromagnets?

<p>Found in electric motors and loudspeakers. (A)</p> Signup and view all the answers

What is the function of the soft iron armature in an electric bell?

<p>It is attracted to the electromagnet and strikes the bell. (C)</p> Signup and view all the answers

What type of magnetism is lost when the current is switched off?

<p>Electromagnetism. (D)</p> Signup and view all the answers

What metal is commonly used as the core of an electromagnet?

<p>Soft Iron. (D)</p> Signup and view all the answers

What does an electric circuit do when the switch is pressed in an electric bell?

<p>It completes the circuit and powers the electromagnet. (C)</p> Signup and view all the answers

What happens when two like poles of magnets come into contact with each other?

<p>They repel each other. (B)</p> Signup and view all the answers

What is one way to strengthen an electromagnet?

<p>Wrapping the coil around an iron core (A)</p> Signup and view all the answers

What charge do protons carry?

<ul> <li>(D)</li> </ul> Signup and view all the answers

What happens to the electrons during the operation of the Van de Graff generator?

<p>They are transferred from the metal dome to the belt. (C)</p> Signup and view all the answers

What happens to the magnetic field of an electromagnet when the battery is reversed?

<p>It reverses direction (C)</p> Signup and view all the answers

If a circuit has two switches and three bulbs connected in series and parallel, what is the function of the first switch?

<p>It turns off the entire circuit (D)</p> Signup and view all the answers

Which circuit symbol represents an open circuit?

<p>A line with a break (D)</p> Signup and view all the answers

What is the main effect when the charged dome of a Van de Graff generator discharges?

<p>Electrons flow back from a metal sphere creating a spark. (C)</p> Signup and view all the answers

How does increasing the number of coils affect the strength of the electromagnet?

<p>It increases the strength proportionally (C)</p> Signup and view all the answers

What is the primary purpose of using crocodile clips in the electromagnet experiment?

<p>To connect the wire to the cells securely (D)</p> Signup and view all the answers

What do we call a combination of two or more cells?

<p>Battery (A)</p> Signup and view all the answers

Which of the following describes the magnetism of an electromagnet?

<p>It can be turned on and off (B)</p> Signup and view all the answers

Current electricity is defined as:

<p>Charge flowing through a wire at a steady rate. (A)</p> Signup and view all the answers

What is the result when enough charge builds up between two points in the Van de Graff generator?

<p>A spark or lightning bolt is created. (C)</p> Signup and view all the answers

In the electromagnet testing experiment, what variable was recorded along with the number of coils?

<p>The number of paperclips attracted (B)</p> Signup and view all the answers

What could potentially be a safety concern when conducting the electromagnet experiment?

<p>Hot wires due to current flow (D)</p> Signup and view all the answers

Which of the following materials would typically not be classified as a conductor?

<p>Rubber (B)</p> Signup and view all the answers

What is static electricity primarily caused by?

<p>The accumulation of charge (A)</p> Signup and view all the answers

What is the definition of a conductor?

<p>A substance that allows electricity to flow (B)</p> Signup and view all the answers

How does an electromagnet work?

<p>It consists of coils of wire around an iron core and requires current to function. (A)</p> Signup and view all the answers

What can happen when static electricity discharges?

<p>An object loses or gains electrons. (B)</p> Signup and view all the answers

What was one of the historical uses of static electricity in the 18th century?

<p>Magic tricks and performances (D)</p> Signup and view all the answers

Which term refers to a circuit that has branches to divide the flow of electricity?

<p>Parallel circuit (C)</p> Signup and view all the answers

What did Benjamin Franklin demonstrate through his famous kite experiment?

<p>The connection between lightning and electricity (C)</p> Signup and view all the answers

Which of the following describes an insulator?

<p>A material that does not allow electricity to pass through (A)</p> Signup and view all the answers

What happens to the bulbs in a series circuit when one of the bulbs is unscrewed?

<p>Both bulbs go out. (C)</p> Signup and view all the answers

How does adding an extra cell in Circuit 2 affect the brightness of the bulbs?

<p>Bulbs shine brighter. (D)</p> Signup and view all the answers

In a parallel circuit, what happens to the remaining bulbs if one bulb is unscrewed?

<p>The other bulbs stay lit. (C)</p> Signup and view all the answers

Which of the following describes the arrangement of bulbs in Circuit 1?

<p>They are arranged in series. (D)</p> Signup and view all the answers

What occurs when the switch in a circuit is opened?

<p>The circuit becomes open. (A)</p> Signup and view all the answers

What does it mean for a circuit to be 'complete'?

<p>Electricity flows continuously around the circuit. (A)</p> Signup and view all the answers

In the context of Circuit 3, how are the bulbs described in terms of brightness?

<p>Both bulbs have equal brightness. (B)</p> Signup and view all the answers

What is a key characteristic of a parallel circuit compared to a series circuit?

<p>Each bulb operates independently. (A)</p> Signup and view all the answers

Flashcards

Current Electricity

A flow of electric charge through a wire at a constant rate.

Proton

A subatomic particle found in the nucleus of an atom. It has a positive charge.

Neutron

A subatomic particle found in the nucleus of an atom. It has no charge.

Electron

A subatomic particle that orbits the nucleus of an atom. It has a negative charge.

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Van de Graff Generator

A device that uses friction to generate static electricity. It works by transferring electrons from a brush onto a belt, which then deposits them onto a metal dome, creating a large static charge.

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Battery

Two or more cells connected together to provide a larger voltage.

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Circuit Diagram

A visual representation of an electrical circuit using symbols to represent different components.

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Conductor

A material that allows electricity to flow easily through it.

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Charge

A physical property of matter caused by the imbalance of electrons and protons, resulting in a positive or negative charge.

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Discharge

The process by which an object loses or gains electrons to become electrically neutral.

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Insulator

A material that resists the flow of electricity.

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Current

The flow of electric charge due to the movement of charged particles.

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Series circuit

A circuit where all components are connected in a single path, so the same current flows through each.

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Parallel circuit

A circuit where components are connected in multiple paths, allowing current to divide.

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Electromagnet

A coil of wire wrapped around a core of iron. It becomes a magnet when current flows through the coil.

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Controllability

The ability of an electromagnet to be turned on and off by controlling the flow of electricity.

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Strength of an electromagnet

The strength of an electromagnet can be increased by increasing the amount of current flowing through it.

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Opposite poles

Parts of an electromagnet that are attracted to each other.

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Magnetic field

The area around a magnet where its magnetic force can be felt.

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Electric Motor

A device that uses electromagnetism to convert electrical energy into mechanical energy.

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Factors affecting electromagnet strength

To increase the strength of an electromagnet, the current can be increased or the number of coils in the electromagnet can be increased.

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Electromagnetism

A type of magnetism that exists only when there is an electric current flowing.

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Switch

A component in a circuit that controls the flow of electricity, often by opening or closing a gap in the circuit.

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Bulb Brightness

The brightness of a light bulb is a measure of how much energy it is using per second.

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Electric Current

The movement of electric charge in a circuit.

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Complete Circuit

A complete path for electricity to flow, allowing a circuit to function.

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Electromagnet Strength

The strength of an electromagnet, measured by the amount of force it can exert on a magnetic object.

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Iron Core

A core made of a ferromagnetic material like iron, which increases the magnetic field strength of an electromagnet.

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Number of Coils

The number of times a wire is wrapped around a core in an electromagnet, which affects the magnetic field strength.

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Current Flow

The amount of electrical current flowing through an electromagnet, which also influences its magnetic field strength.

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Bulb Brightness in a Circuit

The brightness of a light bulb in a circuit depends on the amount of current flowing through it.

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Open Circuit in Series

In a series circuit, if one component fails, the entire circuit breaks and all components stop working.

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Open Circuit in Parallel

In a parallel circuit, if one component fails, the other components continue to work independently.

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Voltage and Bulb Brightness

Adding more cells (batteries) to a circuit increases the voltage, which results in a brighter light bulb.

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Closed Circuit

A closed circuit is a complete loop with no breaks, allowing electricity to flow through it.

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Open Circuit

An open circuit is a broken loop, preventing electricity from flowing through it.

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Study Notes

Year 9 Physics - Basic Electricity

  • Topic 5: Basic Electricity covers static and current electricity.
  • Static Electricity: Built up charge, often created by friction.
  • Current Electricity: Flow of charge through conductors at a steady rate.
  • Circuits: Complete paths for current to flow. This flow is reliant on conductors, not insulators.
  • Series Circuit: A single path for current; one bulb failure causes the whole circuit to fail.
  • Parallel Circuit: Multiple paths for current; a failure in one branch does not affect other branches.
  • Electromagnetism: A temporary magnet created by current-carrying coils, particularly useful for lifting metals.
  • Conductivity: Some materials allow current to flow easily (conductors); some resist current flow (insulators).
  • Experiences & Outcomes: Students investigate electricity, predict circuit function (including electromagnets), and evaluate/adapt their work based on feedback.
  • Learning Intentions: Understanding the build up of static electricity, how circuits work, the types of circuits, and electromagnets and how they work.
  • New Words & Spellings: Key terms for electricity (e.g., charge, discharge, conductor, insulator, current, series circuit, parallel circuit, electromagnet).
  • Van de Graff Generator: A device that demonstrates static electricity, involving transferring of electrons in a dome via a brush and belt.

Lab Experiments/Practical Work

  • Circuit diagrams: Using circuit symbols to represent components (cells, bulbs, wires, switches) to predict behaviour.
  • Conductivity tests: Experiment and testing how different materials affect current flow.
  • Series & Parallel Circuit Experiments: Building and testing series and parallel circuits, observing differences in brightness of bulbs, effect of adding more cells.
  • Electromagnet experiments: Testing electromagnets' strength in terms of the number of coils influencing strength of the magnetic field.

Homework

  • Circuit diagrams: Various questions including drawing circuit diagrams and explaining what happens as you adapt them (e.g., adding cells, more bulbs).
  • Questions relating to the unit: Asking about various concepts, how electricity works, what causes faults in circuits, parallel, series, and electromagnet strength, the importance of being aware and mindful of safety requirements in the lab, etc.

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Related Documents

Year 9 Electricity Topic 5 Teacher Booklet PDF

Description

This quiz focuses on the principles of Basic Electricity essential for Year 9 Physics. You'll explore concepts such as static and current electricity, circuits, and electromagnetism. Test your understanding of conductors, insulators, and circuit configurations while investigating the practical applications of electricity.

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