In which of the circuit current and voltage are in same phase?
Thus clearly, in purely resistive AC circuits, current and voltage are in the same phase or have no lag. So, the correct answer is “Option C”. Note: The phase difference between voltage and current is zero in a purely resistive AC circuit.
What is the relationship between current and voltage in a purely inductive AC circuit?
What is the relationship between voltage and current in a purely inductive circuit? The applied voltage must be equal and opposite to the self-induced EMF at all times; therefore, the current lags the applied voltage by 90° in a purely inductive circuit.
What is the relationship between voltage drops and current in a resistive AC circuit?
Ohm’s law defines the relationship between the voltage, current, and resistance in an electric circuit: i = v/r. The current is directly proportional to the voltage and inversely proportional to the resistance.
What is power factor in AC circuit?
Power factor is defined as the ratio of the average power in an ac circuit to the apparent power, which is the product of the voltage and current magnitudes.
What is the relation between current, voltage and frequency?
The higher the frequency of the voltage, the shorter the time available to change the voltage, so the larger the current has to be. The current, then, increases as the capacitance increases and as the frequency increases.
How is power consumed in a pure resistive AC circuit?
Power in a Pure Resistance In case of pure resistive AC circuits, the power consumed by the circuit is simply the product of voltage and the current as there is no phase angle between current and voltage. The power waveform for a pure resistive AC circuit is shown below. The power waveform consists of a series of positive pulses.
How are voltages and currents related in a resistive circuit?
As the circuit is purely resistive, the effects of inductance and capacitance are negligible and the phase difference is 0. Hence the relationship between the voltage and current in a resistor which is a part of resistive AC circuit is The instantaneous values of currents and voltages are “in phase” along the x- axis of the curve.
What does a purely resistive circuit look like?
In a purely resistive circu… Load is purely resistive (no reactance), the current is in phase with the voltage, and calculations look similar to that in an equivalent DC circuit. If we were to plot the voltage, current, and power waveforms for this circuit, it would look like figure shown.
What is the formula for an AC resistive circuit?
In a resistive DC circuit, both current and voltage are fixed, steady values. In an AC resistive circuit, the current alternates exactly in step with the voltage. The Ohm’s law formula for an AC circuit can be expressed as Unless otherwise stated, all AC voltage and current values are given as effective or rms values.