The winding resistance of a coil can be increased by
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Electrical Engineering · all questionsElectrical Inductors
Electrical Inductors
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An 18 V power supply is connected across a coil with a winding resistance of 180 Ω. Current flow in the coil is
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An inductor, a 1 kΩ resistor, and a switch are connected in series across a 6 V battery. At the instant the switch is closed, the inductor voltage is
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Five inductors are connected in series. The lowest value is 8 µH. If the value of each inductor is twice that of the preceding one, and if the inductors are connected in order of ascending values, the total inductance is
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A 2 mH, a 3.3 mH, and a 0.2 mH inductor are connected in series. The total inductance is
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A 5 mH, a 4.3 mH, and a 0.6 mH inductor are connected in parallel. The total inductance is
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Three 15 mH inductors are in series. The total inductance is
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An inductance of 0.08 µH is larger than
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An inductance of 0.43 mH is smaller than
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The voltage across a coil when = 20 mA/µs and L = 8 µH is
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Faraday's law states that relative motion between a magnetic field and a coil induces a voltage across the coil.
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Inductance is indirectly proportional to the square of the number of turns, the permeability, and the cross-sectional area of the core.
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A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current
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The current through a 120 mH coil is changing at a rate of 150 mA/s. The voltage induced across the coil is
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Two 10 H inductors are in parallel and the parallel combination is in series with a third 10 H inductor. What is the approximate total reactance when a voltage with a frequency of 7 kHz is applied across the circuit terminals?
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Energy is stored by an inductor in an electrostatic field.
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XL is directly proportional to frequency and inductance.
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All coil cores are made of iron.
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The term 'choke' is more commonly used in connection with an inductor used to block off high frequencies.
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A switch, a 220 Ω resistor, and a 60 mH inductor are in series across a 20 V battery. What is the current through the inductor two time constants after the switch is closed?
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