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Questions and Answers
In a circuit with a steady EMF, what happens to the current when the resistance is doubled?
In a circuit with a steady EMF, what happens to the current when the resistance is doubled?
- The current is halved (correct)
- The current is quadrupled
- The current is doubled
- The current remains the same
What does the voltage between two bodies measure?
What does the voltage between two bodies measure?
- The difference in potential between the two bodies (correct)
- The average potential of the two bodies
- The resistance of the two bodies
- The sum of the potential of the two bodies
What is the unit of electrical resistance?
What is the unit of electrical resistance?
- Ampere
- Volt
- Farad
- Ohm (correct)
How does the resistance of a conductor change with its length and cross-sectional area?
How does the resistance of a conductor change with its length and cross-sectional area?
What is the purpose of a Wheatstone Bridge?
What is the purpose of a Wheatstone Bridge?
What is the relationship between magnetic flux density and magnetic materials?
What is the relationship between magnetic flux density and magnetic materials?
What is the role of the Commutator in a DC motor?
What is the role of the Commutator in a DC motor?
How does the distance between plates affect the capacitance of a capacitor?
How does the distance between plates affect the capacitance of a capacitor?
What is the function of Thermocouples in electrical systems?
What is the function of Thermocouples in electrical systems?
What is the measure of the force or pressure applied to electrons to remove them from their orbits and propel them along a wire?
What is the measure of the force or pressure applied to electrons to remove them from their orbits and propel them along a wire?
In which direction is current flow understood to occur?
In which direction is current flow understood to occur?
What does a statement that 12 volts are being applied to a circuit indicate?
What does a statement that 12 volts are being applied to a circuit indicate?
What happens to the current when the voltage driving it through the circuit is doubled?
What happens to the current when the voltage driving it through the circuit is doubled?
What is denoted with reference to a point (e.g. +100 V with reference to 0 V)?
What is denoted with reference to a point (e.g. +100 V with reference to 0 V)?
What is the term for Edison's application of causing electrons to flow across the space between the filament and the plate?
What is the term for Edison's application of causing electrons to flow across the space between the filament and the plate?
Why did Edison's bulb have a vacuum around the filament?
Why did Edison's bulb have a vacuum around the filament?
What happens to free electrons in metallic conductors as the temperature increases?
What happens to free electrons in metallic conductors as the temperature increases?
What would have happened if the electrons had to be forcibly pulled from a cold filament?
What would have happened if the electrons had to be forcibly pulled from a cold filament?
What is the process similar to when some of the free electrons escape from the conductor's surface due to high agitation?
What is the process similar to when some of the free electrons escape from the conductor's surface due to high agitation?
What force opposes the centrifugal force and holds the electrons in a specific orbit?
What force opposes the centrifugal force and holds the electrons in a specific orbit?
What is the movement of electrons called when other free electrons move to fill the space vacated by the first free electron?
What is the movement of electrons called when other free electrons move to fill the space vacated by the first free electron?
What is an atom called if it has too many electrons?
What is an atom called if it has too many electrons?
What determines the amount of energy it takes for an atom to become negatively or positively charged?
What determines the amount of energy it takes for an atom to become negatively or positively charged?
According to the triboelectric series, what happens to materials lower in the series?
According to the triboelectric series, what happens to materials lower in the series?
What can be predicted about the voltage levels generated when two materials close together in the triboelectric series are rubbed together?
What can be predicted about the voltage levels generated when two materials close together in the triboelectric series are rubbed together?
How does the relative humidity affect electrostatic voltages according to the provided data?
How does the relative humidity affect electrostatic voltages according to the provided data?
What did Charles A. Coulomb discover and write about in the 1780s?
What did Charles A. Coulomb discover and write about in the 1780s?
What is the process of forcing a cathode to release electrons either by heating it up or using a high voltage to strip electrons out of it called?
What is the process of forcing a cathode to release electrons either by heating it up or using a high voltage to strip electrons out of it called?
Why is conduction of current in a vacuum much more difficult to achieve?
Why is conduction of current in a vacuum much more difficult to achieve?
What is necessary for electrons to pass from the cathode to the anode in a thermionic valve?
What is necessary for electrons to pass from the cathode to the anode in a thermionic valve?
What type of potential is commonly present at the anode in TV sets?
What type of potential is commonly present at the anode in TV sets?
What is the method of releasing electrons from a cathode by heating it called?
What is the method of releasing electrons from a cathode by heating it called?
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