Fundamentals of Electricity and Electronics

In terms of electrical resistance, which factor decreases resistance in a wire?

Lowering the temperature for most conductors

If a coil resists sudden changes in current due to induced EMF, what property is demonstrated?

Inductance

Why do hollow conductors carry charge only on the outside surface?

Electrostatic equilibrium forces charges to the outer surface

Why are sharp points on conductors likely to have higher electrostatic field intensities?

Electrons cluster more densely at points of curvature

Which formula correctly expresses Ohm's Law?

I=E/R

Which of the following factors does NOT directly affect the resistance of a wire?

Voltage applied across it

Which property of matter primarily determines how easily a material can conduct electricity?

Number of free electrons available

Which law defines electrical power in terms of voltage and current?

Watt's Law

If voltage is doubled across a conductor with fixed resistance, what happens to current?

It doubles

Which principle explains that the induced current always opposes the change that produced it?

Lenz's Law

According to the kinetic theory, why do most substances expand when heated?

Molecules vibrate more, increasing average spacing

Which analogy best describes drift velocity in a conductor?

A steel-ball tube where one pushed ball causes another to exit instantly

Why is electrostatic discharge (ESD) a concern in aircraft maintenance?

It can damage sensitive electronic components

Which phenomenon best explains why solenoids and relays function?

Magnetic fields generated by current

Why do semiconductors occupy a unique role in electronics?

They can act as either conductors or insulators depending on conditions

Why is silver considered the best electrical conductor, despite copper being widely used?

Silver has the most free electrons per atom

What is the main role of valence electrons in atoms?

They establish bonding and reactivity

In generator principles, what determines the polarity of the induced EMF?

The direction of motion relative to the magnetic field

Why is residual magnetism important in generators?

It allows initial voltage build-up for self-excitation

Which statement about static electricity is most accurate?

It results from a temporary imbalance of charges on surfaces

Which law explains that the algebraic sum of voltages around a closed loop is zero?

Kirchhoff's Voltage Law

In a voltage divider circuit, which factor determines the proportion of voltage across each resistor?

The resistance of each resistor relative to the total

When an atom loses one of its outermost electrons, what does it become?

A positive ion (cation)

Why does resistance usually increase with temperature in conductors?

Higher temperature increases atomic vibrations, hindering electron flow

Why do conductors like copper and silver allow current to flow so easily?

Their nuclei attract electrons less strongly, allowing free movement