Understanding RL Circuits

What is the primary function of a resistor in an RL circuit?

• To decrease the inductance

• To store energy in a magnetic field

• To provide resistance to the flow of current

• To increase the voltage in the circuit

How does an inductor in an RL circuit resist changes?

• By opposing changes in current

• By providing resistance to the flow of current

• By increasing the circuit's voltage

• By storing energy in an electric field

What is the time constant in an RL circuit?

• The difference between inductance and resistance

• The product of resistance and capacitance

• The sum of resistance and inductance

• The ratio of inductance to resistance

What happens to the current in an RL circuit over time?

• It decreases exponentially

• It remains constant

• It asymptotically approaches a maximum value

• It increases linearly

Where is the slope of the current vs. time graph the steepest in an RL circuit?

• It remains constant throughout

• At the end

• In the middle

• At the beginning

What is the potential energy stored in an inductor related to?

• The voltage

• The resistance

• The magnetic field

• The electric field

What is the formula for potential energy stored in an inductor?

• C V^2

• L I^2

• 1/2 L I^2

• 1/2 C V^2

What is the current through the resistor a long time after the switch is closed?

• 6.0 amps

• 0 amps

• 1.5 amps

• 3.0 amps

What is the potential drop across the inductor immediately after the switch is closed?

• 0 volts

• 6 volts

• 12 volts

• 24 volts

What is the potential energy stored by the inductor a long time after the switch is closed?

• 0.108 joules

• 0.072 joules

• 0.036 joules

• 0.144 joules