Advertisements
Advertisements
प्रश्न
A capacitor is used in the primary circuit of an induction coil.
उत्तर
High induced voltage is used to charge the capacitor.
A capacitor is used in the primary circuit of an induction coil. This is because when the circuit is broken, a high induced voltage is used to charge the capacitor to avoid sparks.
APPEARS IN
संबंधित प्रश्न
Predict the polarity of the capacitor in a closed circular loop when two bar magnets are moved as shown in the figure.
In any ac circuit, is the applied instantaneous voltage equal to the algebraic sum of the instantaneous voltages across the series elements of the circuit? Is the same true for rms voltage?
Why is choke coil needed in the use of fluorescent tubes with ac mains? Why can we not use an ordinary resistor instead of the choke coil?
If Im is the maximum current, then the average value of power dissipated in a resistance R over a cycle is ______.
The capacitive reactance in an A.C. circuit is ______.
The rms value of potential difference V shown in the figure is ______.
In an alternating current circuit consisting of elements in series, the current increases on increasing the frequency of supply. Which of the following elements are likely to constitute the circuit?
- Only resistor.
- Resistor and an inductor.
- Resistor and a capacitor.
- Only a capacitor.
An alternating voltage v(t) = 220 sin 100πt volt is applied to a purely resistive load of 50 Ω. The time taken for the current to rise from half of the peak value to the peak value is ______.
State any one difference between a direct current (dc) and an alternating current (ac).