When pure inductor is connected across AC supply what happens?
If a pure inductor is connected across the ac source, the average power taken by the inductor is. Answer: (C) zero watt. Explanation: In the positive half cycle of power waveform ideal inductor takes energy from the source.
What is the effect of an inductor when it is connected to AC?
Hence, when a sinusoidal voltage is applied to an inductor, the voltage leads the current by one-fourth of a cycle, or by a 90º phase angle. Current lags behind voltage, since inductors oppose change in current. Changing current induces an emf. This is considered an effective resistance of the inductor to AC.
When an inductor is connected to an alternating voltage source the time lag between voltage and current is?
AC through a Series R + L Circuit We have seen above that the current flowing through a purely inductive coil lags the voltage by 90o and when we say a purely inductive coil we mean one that has no ohmic resistance and therefore, no I2R losses.
What is the time lag between current maximum and voltage maximum?
3.2 ms
Where, Φ = Phase difference between voltage and current At time, t = 0. Hence, the time lag between maximum voltage and maximum current is 3.2 ms.
How to choose the correct inductor for a buck converter?
For a buck converter, choosing the correct value of inductance is important to obtain acceptable inductor and output capacitor sizes and sufficiently low output voltage ripple. As you can see from Fig. 1, the inductor current is made up of ac and dc components.
Can an inductive load damage a DC power supply?
If you’re using a DC power supply to power DC motors, solenoids, fans, relays and other inductive loads, you need some kind of circuit protection. Without this protection, your power supply can be damaged by high voltage spikes from these devices. Figure 1 shows an inductive load connected to a DC power supply.
How is the temperature of an inductor specified?
Irms is normally specified as the dc current that produces an inductor temperature rise of 40°C. Isat is the peak current that produces a specific roll off in inductance — specified as a percentage reduction from the open circuit value and can vary from 5% to 50%. These current ratings are a guide to the inductor performance.
How to select the correct inductors for switching regulators?
It is normally in the order of 10-500mVpk-pk. Selecting the correct ripple current also affects the size of the inductor and the output capacitor. This capacitor must have a sufficiently high ripple current rating, or it overheats and dries out.