Podcast
Questions and Answers
What happens when the current exceeds the fuse's design limit?
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?
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?
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?
Why is a larger voltage used to transmit electricity?
What is the SI unit of voltage?
What is the SI unit of voltage?
What is the relationship between voltage, current, and resistance according to Ohm's Law?
What is the relationship between voltage, current, and resistance according to Ohm's Law?
What is the unit used to measure electrical energy in households?
What is the unit used to measure electrical energy in households?
How does the current in a conductor change with increasing voltage, given a constant resistance?
How does the current in a conductor change with increasing voltage, given a constant resistance?
How is energy in kilowatt-hours computed?
How is energy in kilowatt-hours computed?
How are SI units for electric field represented?
How are SI units for electric field represented?
How does the current in a conductor change with increasing resistance, given a constant voltage?
How does the current in a conductor change with increasing resistance, given a constant voltage?
What happens to the electric charges when a circuit is disconnected from the power supply?
What happens to the electric charges when a circuit is disconnected from the power supply?
What is the direction of electric field lines around a positively charged particle?
What is the direction of electric field lines around a positively charged particle?
How is electric field strength defined?
How is electric field strength defined?
How much energy does the hair dryer use if it is used for 3 minutes?
How much energy does the hair dryer use if it is used for 3 minutes?
In what direction does a positive charge experience a force in an electric field?
In what direction does a positive charge experience a force in an electric field?
What indicates the strength of an electric field in terms of field lines?
What indicates the strength of an electric field in terms of field lines?
What happens to a negative charge in an electric field?
What happens to a negative charge in an electric field?
What determines the atomic number of an element?
What determines the atomic number of an element?
In a neutral atom, what is the relationship between the number of protons and electrons?
In a neutral atom, what is the relationship between the number of protons and electrons?
What is an ion?
What is an ion?
If a neutral helium atom gains one electron, what type of ion is formed?
If a neutral helium atom gains one electron, what type of ion is formed?
How are negative ions formed on the surface of materials like amber, plastic, or hard rubber?
How are negative ions formed on the surface of materials like amber, plastic, or hard rubber?
What happens to the charge of the fur when it transfers electrons to a material like amber or plastic?
What happens to the charge of the fur when it transfers electrons to a material like amber or plastic?
What allows electrons to travel freely inside a picture tube?
What allows electrons to travel freely inside a picture tube?
What happens when salt is dissolved in water?
What happens when salt is dissolved in water?
If an electric field is applied to salt water, which ions will flow in the direction of the field?
If an electric field is applied to salt water, which ions will flow in the direction of the field?
What is the SI unit of electric current?
What is the SI unit of electric current?
What device is used to measure electric current?
What device is used to measure electric current?
According to the historical convention, what type of charge is represented as flowing in a wire to comprise the current?
According to the historical convention, what type of charge is represented as flowing in a wire to comprise the current?
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