Electromangnetism, Inductance & Capacitance and Their application

Question 1

Define inductance and give its units of measurement

Answer 1

The SI unit of inductance is Henry abbreviated as ‘H’. It is defined as the measure of electric current changes at one ampere per second, resulting in an electromotive force of one volt across the inductor. Inductance is defined as the ratio of the induced voltage to the rate of change of current causing it

Question 2

Describe the effect of an inductor in a DC circuit
and give an application

Answer 2

An inductor affects a DC circuit only when the current is first turned on, turned off, or when there is a change in current flow. Otherwise, under constant current conditions it acts like a conductor. An application is an automotive ignition coil.
The effect of an inductor in a circuit is to oppose changes in current through it by developing a voltage across it proportional to the rate of change of the current. An ideal inductor would offer no resistance to a constant direct current; however, only superconducting inductors have truly zero electrical resistance.

Question 3

Describe the effect of an inductor in an AC
circuit and give an application

Answer 3

An inductor can oppose or block the passage of alternating current through it. The inductor either acquires the charge or loses the charge. The current across the inductor changes to equalize the current passing through it. Application of an inductor is ballast in a fluorescent light fixture.

Question 4

Define capacitance and give its units of measurement

Answer 4

Capacitance is the measure of a devices ability to store electrical charge.
Symbol for capacitance (C)
Basic unit of capacitance is the farad (F)
Typical values are microfarads equal to .0000001 farads