Electricity unit review
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Questions and Answers

What is the primary function of a fuse in an electrical circuit?

  • Provides energy to the circuit
  • Completes the circuit to allow current flow
  • Melts to stop the flow of electrons when heated (correct)
  • Measures the amount of current in the circuit
  • Which component in a circuit is responsible for producing light?

  • Resistor
  • Light bulb (correct)
  • Ammeter
  • Motor
  • What does a voltmeter measure in an electrical circuit?

  • The amount of resistance
  • The electric potential (correct)
  • The amount of current
  • The flow of electrons
  • What is the role of a resistor in an electrical circuit?

    <p>To slow down the flow of electrons (B)</p> Signup and view all the answers

    Which of the following correctly describes an open switch in a circuit?

    <p>It prevents the flow of current (A)</p> Signup and view all the answers

    What happens to an object that loses electrons when rubbed with another neutral object?

    <p>It becomes positively charged. (D)</p> Signup and view all the answers

    In which type of circuit do all components stop working if one component fails?

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

    What is the role of a conductor in terms of electron flow?

    <p>To facilitate the flow of electrons. (B)</p> Signup and view all the answers

    What type of current flows in one direction only?

    <p>Direct Current (DC) (C)</p> Signup and view all the answers

    How is voltage measured in an electrical system?

    <p>In volts (V) (D)</p> Signup and view all the answers

    What voltage is required for a coffee grinder with a resistance of 85.0 Ω and a current of 1.41 A?

    <p>119.85 V (B)</p> Signup and view all the answers

    Calculate the current drawn by an electric clothes dryer that is connected to a 230 V source and has a resistance of 9.2 Ω.

    <p>24.89 A (B)</p> Signup and view all the answers

    What is the resistance of a device if a voltage of 110 V causes a current of 10 A?

    <p>11 Ω (D)</p> Signup and view all the answers

    Given a portable radio using a 9.0 V battery that draws a current of 0.025 A, what is the resistance of the radio?

    <p>360 Ω (C)</p> Signup and view all the answers

    How much voltage drop occurs across an electrical load with a resistance of 4.0 Ω where a current of 3.0 A flows?

    <p>12 V (C)</p> Signup and view all the answers

    What does the term 'Ohm' represent in electrical terminology?

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

    Which of the following materials has the strongest tendency to gain electrons?

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

    What is a basic requirement for a functioning electrical circuit?

    <p>Power source, load, wires (A)</p> Signup and view all the answers

    When wool is rubbed on a balloon, what happens to the charges?

    <p>The balloon becomes negative, wool positive (D)</p> Signup and view all the answers

    If hair is rubbed against rabbit fur, what is the resulting charge on each?

    <p>Rabbit fur becomes positive, hair negative (C)</p> Signup and view all the answers

    What is the voltage across resistor 2 in the first circuit with a 9.0V voltage source and a voltage drop of 3.0V across resistor 1?

    <p>6.0V (C)</p> Signup and view all the answers

    In the first circuit, what is the current through resistor 2 if 2.0A is flowing through the circuit?

    <p>2.0A (B)</p> Signup and view all the answers

    For the second circuit with a 9.0V source, if the current before resistor 2 is 3.0A and it splits with 1.0A going through another resistor, what is the current through resistor 2?

    <p>2.0A (C)</p> Signup and view all the answers

    What is the total voltage drop in the second circuit if the voltage source is 9.0V and two different currents are present?

    <p>9.0V (D)</p> Signup and view all the answers

    If the voltage across resistor 2 in the second circuit needs to be calculated after knowing the total voltage and the voltages across other resistors, which calculation is appropriate?

    <p>Total voltage minus the voltage drops across other resistors (C)</p> Signup and view all the answers

    Which components should be included in a circuit diagram for a circuit consisting of a 2-cell battery, light bulb, and a motor?

    <p>2-cell battery, light bulb, motor (C)</p> Signup and view all the answers

    In a circuit with a 1-cell battery, open switch, resistor, and ammeter, what is the correct order of components?

    <p>Battery, switch, resistor, ammeter (B)</p> Signup and view all the answers

    What additional component is necessary in a circuit that includes a 2-cell battery, open switch, fuse, motor, and ground wire?

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

    What is the total voltage supplied in a circuit with a 3-cell battery that also includes a closed switch, clock, and two light bulbs?

    <p>9 V (B)</p> Signup and view all the answers

    In a circuit diagram that includes a 2-cell battery, an open switch, a resistor, and an ammeter, what would be the typical output if the switch is closed?

    <p>Current would flow through the resistor (D)</p> Signup and view all the answers

    What is a key advantage of geothermal energy?

    <p>Produces no carbon emissions (D)</p> Signup and view all the answers

    Which disadvantage is common to both geothermal and nuclear energy?

    <p>Produces hazardous waste (B)</p> Signup and view all the answers

    Which of the following is an advantage unique to tidal energy?

    <p>Energy can be stored (D)</p> Signup and view all the answers

    What is a major disadvantage of fossil fuels?

    <p>They are a finite resource (B)</p> Signup and view all the answers

    How does nuclear energy primarily compare to geothermal energy in terms of carbon emissions?

    <p>Both produce no carbon emissions (C)</p> Signup and view all the answers

    What is one significant disadvantage of hydroelectric power?

    <p>It can harm aquatic environments. (D)</p> Signup and view all the answers

    Which of the following statements about solar energy is true?

    <p>Solar energy reduces electricity bills. (B)</p> Signup and view all the answers

    What is a unique advantage of wind power?

    <p>It creates good paying jobs and businesses. (A)</p> Signup and view all the answers

    What is a common disadvantage of biomass energy?

    <p>It releases carbon dioxide when burned. (D)</p> Signup and view all the answers

    What is a major requirement for wind power generation?

    <p>Constant availability of wind. (C)</p> Signup and view all the answers

    Study Notes

    Circuit Diagram Symbols

    • 2-Cell Battery: Symbol: Two connected battery symbols (+ and -)
    • 3-Cell Battery: Symbol: Three connected battery symbols (+ and -)
    • Open Switch: Symbol: Two lines connected to a gap.
    • Closed Switch: Symbol: Two lines connected with a continuous line.
    • Fuse: Symbol: A symbol resembling a small glass tube with a thin wire.
    • Light bulb: Symbol : A circle with a filament inside.
    • Motor: Symbol : A set of lines in a figure eight configuration.
    • Resistor: Symbol : A zig-zag line.
    • Ammeter: Symbol: A circle with the letter "A" inside.
    • Voltmeter: Symbol: A circle with the letter "V" inside.
    • Ground Connection: Symbol: A line extending downwards with an arrowhead.
    • Conducting Wire: Symbol: A straight line.

    Circuit Functions

    • Battery: Provides energy to the circuit, producing an electric potential difference.
    • 2-Cell or 3-Cell Battery: Provides energy to the circuit, producing an electric potential difference.
    • Open Switch: Stops the current flow, making the circuit inactive.
    • Closed Switch: Completes the circuit so that it works.
    • Fuse: Will melt and stop the flow of electrons when heated to high temperatures, protecting the circuit from excessive current.
    • Light bulb: Produces light and converts electrical energy to light and heat energy.
    • Motor: Slows down the flow of current and converts electrical energy to mechanical energy.
    • Resistor: Slows the flow of electrons in a circuit and helps control the flow; converts electrical energy into other forms of energy like heat and sound.
    • Ammeter: Measures the amount of current flowing through a part of a circuit.
    • Voltmeter: Measures electric potential difference (voltage) between two points in a circuit.
    • Ground Connection: Connects circuits to the ground, removing excess electric charges.
    • Conducting Wire: Connects parts of the circuit, facilitating the flow of electrons.

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    Description

    This quiz covers the essential symbols and functions related to circuit diagrams. Test your knowledge on various components like batteries, switches, and resistors. Perfect for students learning about basic electronics.

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