WorksheetsQuizizz: Inductor & Inductance
Total questions: 20
Worksheet time: 10mins
What is an inductor?
A device that stores energy in an electric field
A device that stores energy in a magnetic field
A resistor with high resistance
A device that converts AC to DC
The unit of inductance is _____.
Farad
Henry
Ohm
Coulomb
Who discovered the law of electromagnetic induction?
Michael Faraday
Lenz
Tesla
Ampere
According to Lenz’s Law, the induced EMF always _____.
Aids the change in current
Opposes the change in current
Increases resistance
Has no effect
What is the symbol of an inductor in a circuit diagram?
A coil or spiral line
A straight line
A triangle
A zigzag line
The inductance of a coil depends on _____.
Number of turns
Core material
Cross-sectional area
All of the above
Which of the following increases inductance?
Fewer turns of wire
Shorter core length
Higher permeability of core
Smaller cross-section area
Formula for inductance of a coil is _____.
L = N²μA / l
L = IR
L = V/I
L = P × t
In an RL circuit, time constant (τ) is equal to _____.
R/L
L/R
L×R
1/LR
If L = 0.1 H and R = 100 Ω, find τ.
0.001 s
0.001 H/Ω = 0.001 s
1 s
10 s
The energy stored in an inductor is given by _____.
W = ½ L I²
W = V × I
W = R × I²
W = L × I
What happens to current when a switch is first closed in an RL circuit?
Current rises gradually
Current drops suddenly
Voltage becomes zero
Resistance increases
In a series connection, total inductance is _____.
The sum of all inductors
The smallest inductance
The largest inductance only
Zero
In a parallel connection, total inductance is _____.
Equal to each inductor
Less than the smallest inductor
Greater than all inductors
Zero
When the magnetic field around a coil changes, ____ is induced.
Voltage (EMF)
Current only
Resistance
Power
What does “self-inductance” mean?
The coil induces voltage in itself due to change in its current
The coil induces voltage in another coil
The current is constant
There is no magnetic field
In a steady DC circuit, an inductor behaves as _____.
A short circuit
An open circuit
A resistor
A capacitor
During sudden switch OFF, what happens in an inductor?
Current becomes zero instantly
Induced voltage appears to oppose current drop
Magnetic field disappears instantly
Nothing happens
The faster the magnetic field changes, the ____ the induced voltage.
Lower
Greater
Same
Unaffected
What does RL circuit stand for?
Resistance–Light
Resistor–Inductor
Rectifier–Load
Relay–Lamp
