Capacitance 3.0

In an RC circuit, what does the capacitor do when the circuit is powered?

• It resists the flow of current

• It stores electrical energy

• It increases the current

• It decreases the resistance

If a resistor of 5 ohms and a capacitor of 2 farads are connected in series, what is the time constant of the circuit?

• 10 seconds

• 7 seconds

• 5 seconds

• 2 seconds

Which of the following graphs best represents the voltage across a capacitor over time in an RC circuit during charging?

• A straight line with a positive slope

• A straight line with a negative slope

• An exponential curve increasing over time

• An exponential curve decreasing over time

Which of the following graphs best represents the current across a capacitor over time in an RC circuit during charging?

• A straight line with a positive slope

• A straight line with a negative slope

• An exponential curve increasing over time

• An exponential curve decreasing over time

What happens to the voltage across the capacitor in an RC circuit as time approaches infinity during charging?

• It approaches zero

• It becomes infinite

• It approaches the supply voltage

• It remains constant at half the supply voltage

Which of the following statements is true about the discharge of a capacitor in an RC circuit?

• The voltage across the capacitor increases exponentially

• The voltage across the capacitor decreases linearly

• The voltage across the capacitor decreases exponentially

• The voltage across the capacitor remains constant

In an RC circuit, if the initial voltage across the capacitor is 0V, what is the voltage across the capacitor after one time constant during charging?

• 0% of the supply voltage

• 37% of the supply voltage

• 63% of the supply voltage

• 100% of the supply voltage

Which of the following factors does not affect the time constant of an RC circuit?

• The resistance value

• The capacitance value

• The supply voltage

• The type of dielectric material in the capacitor

What is the relationship between the time constant and the rate of charging or discharging in an RC circuit?

• A larger time constant means a faster rate

• A larger time constant means a slower rate

• The time constant does not affect the rate

• The time constant is inversely proportional to the rate