Can there be voltage if there is no current?

Voltage attempts to make a current flow, and current will flow if the circuit is complete. It is possible to have voltage without current, but current cannot flow without voltage.

Why is the current in an AC circuit not always in phase with its voltage?

When capacitors or inductors are involved in an AC circuit, the current and voltage do not peak at the same time. This leads to a positive phase for inductive circuits since current lags the voltage in an inductive circuit. The phase is negative for a capacitive circuit since the current leads the voltage.

What happens when voltage and current are not in phase?

When inductance is introduced into a circuit, the voltage and the current will be “out-of-phase,” meaning that the voltage and current do not cross zero, or reach their peaks and valleys at the same time. This phase shift occurs because the inductive reactance changes with changing current.

What happens when there is no current?

When there is no current in the wire, their is no magnetic induction. The electromagnet then is simply a coil with no magnetic field associated with it. The moment we allow a current to flow through, there is a magnetic induction and thus we get an electromagnet.

When the current and voltage are out of phase the power consumed is zero Watts?

out-of-phase, the power consumed is zero watts. It is theoretically possible for a circuit to be energized at 240 volts and have 100 amperes flowing and yet consume no power.

What is the power factor when the reactive power is zero?

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Power Factor Values For the purely resistive circuit, the power factor is 1 (perfect), because the reactive power equals zero. Here, the power triangle would look like a horizontal line, because the opposite (reactive power) side would have zero length.

When no current flows in a conductor free electrons move?

When no current flows in a conductor, free electrons move? And their magnetic fields cancel. When current flows in a conductor, a magnetic field is produced. As free electrons move in one direction, their individual magnetic fields? .

Do voltage and current have to be zero at the same time?

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.

What is the relationship between voltage and current in single phase circuit?

1. Introduction to Single Phase AC Circuit: In a dc circuit the relationship between the applied voltage V and current flowing through the circuit I is a simple one and is given by the expression I = V/R but in an a c circuit this simple relationship does not hold good.

What will happen if current and voltage are 90 degrees out of phase?

Explanation: We know that in Pure inductive circuit, current is lagging by 90 degree from voltage ( in other words, Voltage is leading 90 Degree from current) i.e the pahse difference between current and voltage is 90 degree. So If Current and Voltage are 90 Degree Out of Phase, Then The Power (P) will be zero.

Why is there an instant between positive and negative voltage?

So, there always has to be an instant between positive voltage and negative voltage when the voltage is zero, no matter how brief. 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.