Capacitors

What is the function of a capacitor connected across a DC power source?

• Accumulate charge

• Block DC current

• Store energy

• Discharge energy

Answer explanation

A capacitor connected across a DC power source accumulates charge.

What can limit the charge/discharge rate of a capacitor?

• Inductor

• Diode

• Resistor

• Transistor

Answer explanation

A resistor can limit the charge/discharge rate of a capacitor by controlling the flow of current. It acts as a barrier, slowing down the charging and discharging process.

What is the purpose of using a capacitor to block DC current?

• Couple separate components

• Pass pulses

• Remove spikes from signals

• Adjust frequency response

What is the dielectric in a capacitor usually made of?

• Solid or paste

• All of the above

• Liquid or gel

• Gaseous or vacuum

How do electrons behave when a capacitor is connected to a DC power source?

• Migrate onto the negative plate

• Create electron holes

• Repel electrons from the other plate

• All of the above

What happens when a resistor is placed across the leads of a charged capacitor?

• The capacitor stores more energy

• The capacitor discharges through the resistor

• The capacitor charges further

• The capacitor blocks DC current

What is the purpose of using a capacitor to smooth the output voltage provided by power supplies?

• Couple separate components

• Block DC current

• Adjust frequency response

• Remove spikes from signals

What are the plates of a capacitor made from?

• Thin metal film

• All of the above

• Rolled-up film

• Metallized plastic film