Understanding Electrical Concepts: Resistance, Reactance, and Impedance

What is the primary function of resistance in electrical circuits?

• To stabilize voltage fluctuations

• To decrease the current flow

• To increase the current flow

• To convert AC to DC

What phenomenon occurs when a voltage difference is applied across a conductor connected to a light bulb?

• No change in the light bulb

• The light bulb turns off

• The light bulb flickers

• The light bulb turns on

Which type of current remains constant in magnitude?

• Neither AC nor DC

• Alternating current (AC)

• Direct current (DC)

• Both AC and DC

What is the effect of a resistor in both AC and DC circuits?

• Has no effect on current flow

• Decreases current flow

• Converts AC to DC

• Increases current flow

What causes the current to lag behind the voltage in AC circuits?

• Capacitive reactance

• Inductive reactance

• Resistance

• Direct current interference

Which component in an AC circuit can cause the current to lead the voltage?

• Inductor

• Transformer

• Resistor

• Capacitor

In the water analogy, what does the water wheel represent in electrical circuits?

• An inductor

• A resistor

• A capacitor

• A transformer

How does capacitive reactance affect current flow in AC circuits?

• It causes current to lag behind voltage

• It stabilizes the current flow

• It causes current to lead voltage

• It has no effect on current flow

What is impedance in electrical circuits?

• The total opposition to current flow combining resistance and reactance

• The resistance to voltage only

• A measure of voltage stability

• The ability to convert AC to DC

Which analogy is used to explain the behavior of electrical components in circuits?

• Air pressure

• Water flow

• Sound waves

• Traffic flow