Electricity Chapter 13 Review
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Questions and Answers

What type of circuit allows electrons to flow in more than one path?

  • Parallel circuit (correct)
  • Series circuit
  • Direct circuit
  • Closed circuit
  • A circuit breaker is designed to allow current to flow even when it is too high.

    False (B)

    What is the unit for electrical resistance?

    Ohm

    A __________ cell can be recharged and reused many times.

    <p>secondary</p> Signup and view all the answers

    What does the 'A' in AC current stand for?

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

    The term 'thermal' is synonymous with heat.

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

    Match the following electrical components with their primary function:

    <p>Switch = Turns electrical flow on and off Fuse = Prevents excessive current Transformer = Transforms electrical energy Circuit breaker = Interrupts flow when current is too high</p> Signup and view all the answers

    What type of electricity flows in one direction?

    <p>Direct current</p> Signup and view all the answers

    The basic particle of electricity is called an __________.

    <p>electron</p> Signup and view all the answers

    What happens to a wire if too much current flows through it?

    <p>It becomes hot (C)</p> Signup and view all the answers

    Which type of resource is constantly replenished and is considered the best?

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

    Lightning rods create a safe path for lightning to enter buildings.

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

    What is the term used for a charged atom?

    <p>Ion</p> Signup and view all the answers

    The process of losing an electric charge is called ______.

    <p>Discharge</p> Signup and view all the answers

    Match the following concepts with their definitions:

    <p>Conductor = A substance that allows the movement of electrons Insulator = A substance that doesn't allow free electron flow Static Electricity = Electricity produced when there is an imbalance of charge Friction = A type of charging that occurs by rubbing objects together</p> Signup and view all the answers

    What type of electricity is characterized by an imbalance of charge on a surface?

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

    Protons have a negative electric charge.

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

    What is created from a giant spark between clouds and the ground?

    <p>Lightning</p> Signup and view all the answers

    In charging by induction, the charging objects ______ touch the other.

    <p>don't</p> Signup and view all the answers

    When two like charges are brought together, what will happen?

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

    What is the unit and symbol for voltage?

    <p>Volt, V (C)</p> Signup and view all the answers

    A voltmeter is used to measure current in a circuit.

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

    What is the primary function of a ground pin in electrical plugs?

    <p>To provide a safe path for electrical current in case of a fault.</p> Signup and view all the answers

    The law that relates voltage, current, and resistance is known as _______.

    <p>Ohm's Law</p> Signup and view all the answers

    Match the following electrical components with their characteristics:

    <p>Voltage = Difference in electric potential energy per unit charge Resistance = Opposition to the flow of current Current = Rate of electron flow Variable resistor = Allows for changing resistance in a circuit</p> Signup and view all the answers

    What happens when one bulb burns out in a series circuit?

    <p>All bulbs turn off (B)</p> Signup and view all the answers

    In a parallel circuit, the current is the same at every point in the circuit.

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

    Name two types of appliances that typically use 240 V.

    <p>Electric ovens, dryers.</p> Signup and view all the answers

    When wiring a house, larger diameter cables are used because they can carry _______.

    <p>more current</p> Signup and view all the answers

    What is the voltage on each lamp in a parallel circuit if the battery voltage is 30 V?

    <p>30 V (C)</p> Signup and view all the answers

    Flashcards

    Voltage

    The difference in electric potential energy per unit charge between two points in a circuit.

    Resistance

    The opposition to the flow of electric current in a circuit.

    Current

    The rate of flow of electric charge past a point in a circuit.

    Ohm's Law

    A relationship between voltage, current, and resistance in a circuit. It states that voltage is directly proportional to current and resistance.

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    Series Circuit

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

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    Parallel Circuit

    A circuit in which components are connected in separate paths, so current can flow through different branches.

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    Variable Resistor

    A type of resistor whose resistance can be adjusted.

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    Ground Fault Circuit Interrupter (GFI)

    A device designed to protect against electric shock by providing a low-resistance path to ground.

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    Open Circuit

    A circuit with no complete path for current to flow.

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    Closed Circuit

    A circuit with a complete path for current to flow.

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    Ohm

    The unit for electrical resistance.

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    Fuse

    A device that makes sure that the current doesn't get too high.

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    Switch

    A device that can allow electrons to stop flowing, then flowing again.

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    Direct Current (DC)

    A type of current where electrons flow in one direction.

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    Transformer

    A device that transforms electrical energy into other forms of energy.

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    Power

    The rate at which electrical energy is produced or consumed in a given time.

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    Electric Circuit

    A continuous path for electron flow is an electric circuit.

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    Primary Cells

    These types of cells cannot be recharged.

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    Friction Charging

    The process of charging objects by rubbing them together, causing a transfer of electrons.

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    Conductor

    A substance that allows electrons to flow freely through it, making it good for conducting electricity.

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    Electric Spark

    The rapid transfer of excess electric charge from one object to another, often creating a visible spark.

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    Electroscope

    An instrument used to detect the presence and sign of static electric charges.

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    Induction Charging

    The process of charging an object without any physical contact, by bringing a charged object near it.

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    Insulator

    A material that resists the flow of electrons, making it a poor conductor of electricity.

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    Ion

    A charged atom, with an imbalance of protons and electrons, leading to an overall positive or negative charge.

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    Conduction Charging

    A type of charging by direct contact, where one charged object touches another, allowing transfer of charge.

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    Electrostatic Force

    The force of attraction or repulsion between electrically charged objects.

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    Charge Separation

    The phenomenon of a neutral object attracting a charged object due to the separation of charges within the neutral object.

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    Study Notes

    Electricity Chapter 13 Review

    • Potential Difference (Voltage): Voltage is the difference in electric potential energy per unit charge measured between two points. Defined as the difference in electric potential energy per unit charge.

    • Voltage Unit and Symbol: Unit is Volts (V), Symbol is V

    • Voltage Measurement: Measured with a voltmeter.

    • Voltmeter Connection: Connected in parallel in a circuit.

    • Resistance in Circuits: Resistance is the opposition to the flow of electric current.

    • Resistance Unit and Symbol: Unit is Ohms (Ω), Symbol is Ω

    • Resistance Measurement: Measured with an ohmmeter.

    • Variable Resistor: A variable resistor allows adjustable resistance in a circuit.

    • Ohm's Law: Current (I) equals voltage (V) divided by resistance (R). (I = V/R)

    • Resistance Calculation: Resistance equals voltage divided by current. (R = V/I)

    • Current Calculation: Current equals voltage divided by resistance. (I = V/R)

    • Example Calculation: For a heater with 38 ohms and 240 V, calculate current: I = 240 V / 38 Ω = 6.32 A

    Series vs. Parallel Circuits

    • Series Circuit Difference: In a series circuit, components are connected in a single path.

    • Series Bulb Failure: If one bulb burns out in a series circuit, all other bulbs go out.

    • Parallel Circuit Difference: In a parallel circuit, components are connected in multiple paths.

    • Parallel Bulb Failure: If one bulb burns out in a parallel circuit, the other bulbs remain lit.

    • Parallel Circuit Current: The current is the same in any part of a parallel circuit.

    • Series Circuit Current: The current is the same in every part of a series circuit.

    • Series Circuit Voltage Division: Voltage is divided among components in a series circuit proportionally to their resistance.

    • Parallel Circuit Voltage: Voltage is the same across each component in a parallel circuit.

    Practical Wiring

    • Household Wiring: Most household circuits are wired in parallel.

    • Larger Diameter Cables: Larger diameter cables are used for high-current applications or long-distance transmission lines to reduce resistance.

    Safety

    • High Voltage Appliances: Examples of appliances that typically use 240 volts include electric stoves and ovens etc

    • Grounding Pins: Grounding pins provide a path for fault currents to ground.

    • Ground Fault Interrupter (GFI): A Ground Fault Interrupter (GFI) is a safety device that senses a small current leakage to ground and immediately interrupts the circuit to prevent electric shock.

    • Bathroom GFI Use: GFI outlets are commonly found in bathrooms to provide a safety measure for people who might be wet.

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    Description

    This quiz focuses on key concepts from Chapter 13 of Electricity, including potential difference (voltage), resistance, and Ohm's Law. Test your understanding of voltage measurements, the use of voltmeters and ohmmeters, and the relationships among current, voltage, and resistance. Prepare to reinforce your knowledge with practical applications.

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