What is the main function of an inductor?
Block all current
Store energy in a magnetic field
Increase voltage
Store energy in an electric field
Which unit is used to measure inductance?
Henry
Farad
Tesla
Ohm
Which component behaves most like an inductor?
Switch
Flywheel
Water tank
Battery
An inductor resists changes in current.
True
False
Inductors store energy permanently.
True
False
An ideal inductor allows DC current to pass once steady state is reached.
False
True
Inductors work because of chemical reactions inside them.
True
False
what happens when current through an inductor is suddenly switched off?
There can be a voltage peak because of the collapsing magnetic field trying to keep the current balance.
Why are inductors often used in power supplies?
To smooth current, reduce ripple, and filter noise.
Give one real-life device where an inductor is essential and explain why.
In power adapters or SMPS, inductors store and transfer energy efficiently during switching.
Why can inductors cause sparks when a switch is opened?
Because the induced high voltage tries to maintain current flow when the circuit is suddenly broken.
True or False: Increasing the number of coil turns increases inductance.
True
What is the relationship between inductors and magnetic fields?
Current in an inductor creates a magnetic field, and changes in that field induce voltage.
Why are inductors sometimes called “chokes”?
Because they limit or “choke” rapid changes in current, especially in AC circuits.
