Electrostatic Voltages and Generation Quiz

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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?

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?

Ampere

Volt

Farad

Ohm (correct)

How does the resistance of a conductor change with its length and cross-sectional area?

Resistance is directly proportional to length and inversely proportional to cross-sectional area Signup and view all the answers

What is the purpose of a Wheatstone Bridge?

To measure the resistance of a material Signup and view all the answers

What is the relationship between magnetic flux density and magnetic materials?

Magnetic materials conduct magnetic flux easily Signup and view all the answers

What is the role of the Commutator in a DC motor?

To control the direction of current flow in the motor's armature Signup and view all the answers

How does the distance between plates affect the capacitance of a capacitor?

Increasing the distance decreases capacitance Signup and view all the answers

What is the function of Thermocouples in electrical systems?

To convert thermal energy to electrical energy Signup and view all the answers

What is the measure of the force or pressure applied to electrons to remove them from their orbits and propel them along a wire?

Electromotive force Signup and view all the answers

In which direction is current flow understood to occur?

From negative to positive Signup and view all the answers

What does a statement that 12 volts are being applied to a circuit indicate?

The electromotive force propelling the electrons Signup and view all the answers

What happens to the current when the voltage driving it through the circuit is doubled?

It doubles Signup and view all the answers

What is denoted with reference to a point (e.g. +100 V with reference to 0 V)?

Potential difference Signup and view all the answers

What is the term for Edison's application of causing electrons to flow across the space between the filament and the plate?

Thermionic emission Signup and view all the answers

Why did Edison's bulb have a vacuum around the filament?

To prevent the filament from burning Signup and view all the answers

What happens to free electrons in metallic conductors as the temperature increases?

They become more agitated and move faster Signup and view all the answers

What would have happened if the electrons had to be forcibly pulled from a cold filament?

The filament would have been destroyed Signup and view all the answers

What is the process similar to when some of the free electrons escape from the conductor's surface due to high agitation?

Boiling water Signup and view all the answers

What force opposes the centrifugal force and holds the electrons in a specific orbit?

Electrostatic force Signup and view all the answers

What is the movement of electrons called when other free electrons move to fill the space vacated by the first free electron?

Electron flow Signup and view all the answers

What is an atom called if it has too many electrons?

Negatively charged ion Signup and view all the answers

What determines the amount of energy it takes for an atom to become negatively or positively charged?

Electrons in valence band Signup and view all the answers

According to the triboelectric series, what happens to materials lower in the series?

They become negatively charged Signup and view all the answers

What can be predicted about the voltage levels generated when two materials close together in the triboelectric series are rubbed together?

They will produce low voltage Signup and view all the answers

How does the relative humidity affect electrostatic voltages according to the provided data?

Higher humidity leads to lower voltages Signup and view all the answers

What did Charles A. Coulomb discover and write about in the 1780s?

Relationship between attracting or repelling charged bodies Signup and view all the answers

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?