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Questions and Answers
What is the unit of an inductor?
What is the unit of an inductor?
- Henry (correct)
- Volts
- Hertz
- Joules
An inductor behaves like an open circuit when provided with a DC supply.
An inductor behaves like an open circuit when provided with a DC supply.
False (B)
What is the formula for the energy stored in an inductor?
What is the formula for the energy stored in an inductor?
W = 1/2 * LI^2
The voltage across an inductor is given by the equation V = -L * ______
The voltage across an inductor is given by the equation V = -L * ______
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Match the following terms related to inductors with their descriptions:
Match the following terms related to inductors with their descriptions:
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Study Notes
Inductor Basics
- Inductors are energy-storing elements that store energy in the form of an electromagnetic field.
- Symbolic notation for an inductor is represented simply as "L".
- When connected to a DC supply, an inductor acts like a short circuit.
Measurement and Formulae
- The unit of inductance is the Henry (H).
- Voltage across an inductor can be expressed as ( V = -L \frac{di}{dt} ), where ( L ) is inductance and ( \frac{di}{dt} ) is the rate of change of current.
Power and Energy in Inductors
- Power in an inductor is calculated using the formula ( P = Vi ), where ( P ) is power, ( V ) is voltage, and ( i ) is current.
- Energy stored in an inductor can be derived using ( W = P \cdot x \cdot t ) where ( W ) is energy, ( P ) is power, ( x ) is distance, and ( t ) is time.
- Energy can also be expressed as ( W = \int_{0}^{t} I \cdot \frac{di}{dt} ), emphasizing the integration of the current over time.
- The energy stored in an inductor is calculated as ( W = \frac{1}{2} LI^2 ). This illustrates that energy is proportional to the inductance and the square of the current.
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