Inductor Behavior and Time Constants

The video tutorial explains the concept of the time constant in inductive resistive circuits, focusing on current buildup and decay in an inductor. It covers the calculation of the time constant, steady-state current, and energy stored in the inductor. The tutorial also provides examples to illustrate these concepts, highlighting the exponential nature of current changes in such circuits.

What happens to the voltage across the inductance when the current reaches its steady state value?

• It becomes negative.

• It becomes zero.

• It becomes equal to the applied voltage.

• It doubles.

How is the time constant of an LR circuit expressed?

• As the difference between L and R

• As the ratio of L to R

• As the sum of L and R

• As the product of L and R

What is the effect of a large inductance on the time constant?

• It decreases the time constant.

• It has no effect on the time constant.

• It increases the time constant.

• It makes the time constant zero.

In the example given, what is the final steady state current in the inductor?

• 5.67 amps

• 8.67 amps

• 6.67 amps

• 7.67 amps

How long does it approximately take to reach the steady state value in terms of time constants?

• Five time constants

• Four time constants

• Three time constants

• Six time constants

What happens to the energy stored in the inductor when the switch is moved to position two?

• It is transferred to R1.

• It remains in the inductor.

• It is dissipated through R2.

• It is stored in the voltage source.

What type of curve represents the decay of current in an inductor?

• Quadratic decay curve

• Linear decay curve

• Exponential decay curve

• Logarithmic decay curve

In the example, what is the time constant of the circuit with a 20 mH inductor and a 60 Ohm resistor?

• 5 milliseconds

• 4 milliseconds

• 3 milliseconds

• 2 milliseconds

At the end of three time constants, what percentage of the original current remains?

• 20%

• 15%

• 10%

• 5%

What is the initial current in the example with a 20 mH inductor?

• 5 amps

• 2 amps

• 3 amps

• 4 amps