Atomic Number and Electric Charge
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Questions and Answers

What happens when the current exceeds the fuse's design limit?

  • The metal melts away and the circuit is broken (correct)
  • The metal becomes stronger and the circuit remains closed
  • The metal expands and the circuit remains closed
  • The metal is unaffected and the circuit remains closed

    • What is the relationship between power, voltage, and current as described in the text?

  • Power is directly proportional to both voltage and current
  • Power is directly proportional to voltage and current (correct)
  • Power is directly proportional to voltage and inversely proportional to current
  • Power is inversely proportional to both voltage and current

    • What is the definition of voltage?

  • The potential energy of electric charges when the circuit is disconnected from the power supply
  • The energy per unit charge provided to charged particles by a power supply (correct)
  • The work done by a charged particle divided by the size of the charge
  • The pressure causing charges to flow in a circuit

    • Why is a larger voltage used to transmit electricity?

    <p>To decrease the current flowing through the wires</p> Signup and view all the answers

    What is the SI unit of voltage?

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

    What is the relationship between voltage, current, and resistance according to Ohm's Law?

    <p>I = V / R</p> Signup and view all the answers

    What is the unit used to measure electrical energy in households?

    <p>Kilowatt-hours</p> Signup and view all the answers

    How does the current in a conductor change with increasing voltage, given a constant resistance?

    <p>The current increases</p> Signup and view all the answers

    How is energy in kilowatt-hours computed?

    <p>By expressing power in kilowatts and time in hours</p> Signup and view all the answers

    How are SI units for electric field represented?

    <p>Newtons per coulomb</p> Signup and view all the answers

    How does the current in a conductor change with increasing resistance, given a constant voltage?

    <p>The current decreases</p> Signup and view all the answers

    What happens to the electric charges when a circuit is disconnected from the power supply?

    <p>The charges have potential energy</p> Signup and view all the answers

    What is the direction of electric field lines around a positively charged particle?

    <p>Radially outward</p> Signup and view all the answers

    How is electric field strength defined?

    <p>Force on a charged object divided by the size of the charge on the object</p> Signup and view all the answers

    How much energy does the hair dryer use if it is used for 3 minutes?

    <p>0.0938 kWh</p> Signup and view all the answers

    In what direction does a positive charge experience a force in an electric field?

    <p>Same direction as field lines</p> Signup and view all the answers

    What indicates the strength of an electric field in terms of field lines?

    <p>Spacing or density of the field lines</p> Signup and view all the answers

    What happens to a negative charge in an electric field?

    <p>Feels a force opposite to the direction of field lines</p> Signup and view all the answers

    What determines the atomic number of an element?

    <p>The number of protons in the nucleus</p> Signup and view all the answers

    In a neutral atom, what is the relationship between the number of protons and electrons?

    <p>The number of protons and electrons is the same</p> Signup and view all the answers

    What is an ion?

    <p>An atom that has gained or lost one or more electrons</p> Signup and view all the answers

    If a neutral helium atom gains one electron, what type of ion is formed?

    <p>A negative ion</p> Signup and view all the answers

    How are negative ions formed on the surface of materials like amber, plastic, or hard rubber?

    <p>By the action of friction, transferring electrons from fur to the surface</p> Signup and view all the answers

    What happens to the charge of the fur when it transfers electrons to a material like amber or plastic?

    <p>The fur acquires a net positive charge</p> Signup and view all the answers

    What allows electrons to travel freely inside a picture tube?

    <p>The presence of a near vacuum</p> Signup and view all the answers

    What happens when salt is dissolved in water?

    <p>The sodium and chlorine ions separate and can move about</p> Signup and view all the answers

    If an electric field is applied to salt water, which ions will flow in the direction of the field?

    <p>Positive sodium ions</p> Signup and view all the answers

    What is the SI unit of electric current?

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

    What device is used to measure electric current?

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

    According to the historical convention, what type of charge is represented as flowing in a wire to comprise the current?

    <p>Positive charge</p> Signup and view all the answers

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