You may wonder how a series teaching the ABC's of the Basic question bank could have a part D. Simply because this is not questions out of the question bank but it is support material to help you to deal with some of the questions, some math, some logic.

Many of the Basic Question Bank questions can simply be answered  by understanding some basics. There are four answers to select from for each question and often, using a bit of logic, you can select the correct answer by eliminating the answers which don't fit.

 I.E.:

Series Resistance

The total resistance of a string of resistors will be larger than the largest resistor.

If you have two resistors of the same value the total series resistance will be twice that of each resistance, Three resistors of the same value would be three times and so on.

Parallel Resistances

The total resistance will be smaller than the resistor with the lowest resistance value.

If you have two equal value resistors in parallel the total resistance would be one half that of each resistance value. Three resistors, total would be 1/3rd of each value.

Power in Resistance Calculations

When given two series resistors of the same resistance value and one is rated at one watt heat dissipation and the second is rated at 5 watts the circuit is limited in overall power disipation by the smallest power rating resistor. If you go beyond that the smallest power value resistor will burn up. The total power this basic series resistance circuit can dissipate would be two watts, one watt for each resistor.

Capacitors

Capacitors are made up with two metal plates separated by a dielectric which could be any number of materials such as air plastic, glass, or even wax paper. If you double the area of the plates you double the capacitance. If you double the distance the plates are separated from each other capacitance is halved. By changing the dielectric material from one type to another the capacitance will be affected.

By connecting two capacitors of equal value in series it's like doubling the distance appart the plates are and so total circuit capacitance is one half of either capacitor

By connecting two capacitors of equal value in parallel it's as if you doubled the plate size of a capacitor so the new equivalent value of the circuit would be double the capacitance of one of the individual capacitors.

 Capacitors tend to oppose changes in voltage.

Capacitance is measured in Farads, microfarads, nanofarads, picofarads.

Inductors

Inductors are made of conductors usually wound into coils, some are air core and some have iron or ferrite cores. Some even have non-ferous slugs in the cores.

By connecting two equal value inductors in series it has the effect as if you took one of those inductors and doubled the turns of wire over its core and so the inductance of the circuit is doubled.

By connecting two equal value inductors in parallel the inductance of the combination is halved.

 Inductors tend to oppose changes in current.

Inductance is measured in Henrys, milihenrys, microhenrys.