What happens when the initial current is zero?
What happens when the initial current is zero?
Thus, if the initial current is zero, some small time after the switch is closed it will still be approximately zero. Small note: The voltage across an inductor is equal and opposite to the induced EMF in the circuit. Thus, it is a matter of semantics if the voltage is across the inductor or if an opposite voltage is induced in the loop.
Can a voltage and current be zero at the same time?
Same thing for current. With resistors, voltage and current are always proportional to each other, so they have to be zero at the same time. Inductors and capacitors store energy, so the voltage zero and the current zero do NOT have to occur at the same time — and in most cases, they cannot occur at the same time.
Is the DC resistance of an ideal inductor zero?
The DC resistance of an ideal inductor is zero. If a DC current is flowing through it, the resulting voltage across the inductor is zero. The average voltage is the DC component of the voltage. Thanks for contributing an answer to Electrical Engineering Stack Exchange!
When does an inductor oppose a change in voltage?
Inductor opposes the change in current. So, initially when the current in the circuit is zero, and the moment you switch it on, inductor opposes the change in current. So, it will act as an open circuit. Similarly, capacitor opposes the change in voltage.
Thus, if the initial current is zero, some small time after the switch is closed it will still be approximately zero. Small note: The voltage across an inductor is equal and opposite to the induced EMF in the circuit. Thus, it is a matter of semantics if the voltage is across the inductor or if an opposite voltage is induced in the loop.
Is the current in an inductor zero just after closing the switch?
This is derived by finding the differential equation in terms of current by using KVL. Is this true that the current in the circuit consisting of an inductor, a capacitor and a resistor (all in series) is zero too at the time just after closing the switch?
The DC resistance of an ideal inductor is zero. If a DC current is flowing through it, the resulting voltage across the inductor is zero. The average voltage is the DC component of the voltage. Thanks for contributing an answer to Electrical Engineering Stack Exchange!
Why is the current zero in an LR circuit?
Similarly, if a problem takes as a premise that the current through an inductor is initially some value, there’s no need to know how it got to be that way in order to solve the problem for t > 0. At t = 0 in an LR circuit, the current is zero because at t = 0 the inductor opposes the current. It becomes itself like an opposing battery.
