What does a resistor do in an AC circuit?

Resistors are “passive” devices, that is they do not produce or consume any electrical energy, but convert electrical energy into heat. In DC circuits the linear ratio of voltage to current in a resistor is called its resistance.

When an AC supply is connected to a pure resistor Why is the power produced always positive?

Therefore, in a purely resistive circuit, the power is never zero. Moreover, this is due to the instantaneous values of the current and voltage being always negative or positive. Also, the frequency of the purely resistive circuit’s power cycle is double that of the current and voltage waves.

Is power dissipated in a resistor *?

Furthermore, power dissipation in resistors is considered a naturally occurring phenomenon. The fact remains that all resistors that are part of a circuit and has a voltage drop across it will dissipate electrical power.

Can resistor reduce AC voltage?

Connect a resistor in series with any load. As the current will flow , some voltage will drop in resistance. And the leftover voltage will appear on load. The leftover voltage is reduced since some voltage is dropped in the resistor.

When AC is connected to a resistor What is the phase difference between the current and voltage?

The phase difference between current and voltage in an AC circuit is 4Π​ radian.

Why do resistors dissipate power?

Any resistor in a circuit that has a voltage drop across it dissipates electrical power. This electrical power is converted into heat energy hence all resistors have a power rating. This is the maximum power that can be dissipated from the resistor without it burning out.

When a resistor is connected to AC What is the current?

The change in direction of current in AC supply does not affect resistors behavior. So the current in the resistor will rise and fall according to the voltage as it rises and falls. The voltage and current in AC resistive circuit reach maximum, then fall to zero and reach minimum at the same time.

Where is power dissipated in AC circuit?

Since the current and voltage in an ac circuit are both time dependent, the instantaneous power \[p\left( t \right) = i\left( t \right)v\left( t \right)\] is also time dependent. Therefore, power dissipated through the AC circuit is zero.

Why is there a phase difference between voltage and current?

When capacitors or inductors are involved in an AC circuit, the current and voltage do not peak at the same time. It is customary to use the angle by which the voltage leads the current. This leads to a positive phase for inductive circuits since current lags the voltage in an inductive circuit.