Electrical Properties

Question 1

Define resistance, giving its unit of measurement

Answer 1

Opposes the flow of electrical current in both AC and DC circuits, measured in Ohms (Ω)

Question 2

Define capacitance, giving its unit of measurement

Answer 2

Stores charges and opposes changes in voltage, measured in farads (F). Can block DC and allow AC to pass

Question 3

Define inductance, giving its unit of measurement

Answer 3

Inductors oppose/resist changes in flow of electrical current and store energy in a magnetic field when current flows through them, measured in Henries (H)

Question 4

Define reactance, giving its unit of measurement

Answer 4

The opposition to the flow of AC, depending on the frequency, caused by either capacitors or inductors, measured in ohms (Ω)

Question 5

Define impedance, giving its unit of measurement

Answer 5

An overall measure of resistance in an AC, combining resistance and reactance (capacitance and inductance), and accounts for how capacitors and inductors behave

Question 6

Name the 2 types of reactance

Answer 6

Capacitive reactance & inductive reactance

Question 7

Explain the two types of reactance

Answer 7

Capacitive (capacitor opposes flow of AC, high frequencies = low reactance lets more current through, low frequencies high reactance blocks more current)
Inductive (inductor opposes flow of AC, high frequencies = high reactance blocks more current, low frequencies = low reactance lets more current through)

Question 8

What is the difference between resistance and reactance?

Answer 8

Resistance is the opposition of current in both AC and DC no matter the frequency
Reactance is the opposition of current in AC only, depending on the frequency