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What will be happened when DC motor is started by AC supply explain why DC series motor Cannot start at no load condition?

As the series motor started with no load, the current drawn from supply is very low. It is the same current which flows through series field winding. Hence as the current is low, flux produced by series field winding are very less. This causes increase in speed dangerously due to very low flux ( field current).

What will happen if a DC series motor is connected to AC supply?

Detailed Solution. When AC supply is given to DC series motor: An AC supply will exert unidirectional torque because the direction of armature current and field current reverses at the same time and the direction of rotation will as it is.

When the frequency of the voltage applied to a series RL circuit increases what happens to inductive reactance?

The inductive reactance is determined using equation 8–21a. If in this series circuit the frequency of the applied voltage increases, then inductive reactance increases and the voltage drop across the inductor increases because the inductive reactance is a larger portion of the total impedance in the circuit.

What is the impact on phase angle when the frequency of the voltage applied to a series RC circuit is increased?

Thus if the frequency of the voltage applied to a series RC circuit is increased, the phase angle decreases.

When the frequency of the applied voltage in a series RL circuit is increased What happens to the inductive reactance?

The inductive reactance is determined using equation 8–21a. If in this series circuit the frequency of the applied voltage increases, then inductive reactance increases and the voltage drop across the inductor increases because the inductive reactance is a larger portion of the total impedance in the circuit.

How do you calculate RL in a circuit?

Series RL Circuit AnalysisSince the value of frequency and inductor are known, so firstly calculate the value of inductive reactance XL: XL = 2πfL ohms.From the value of XL and R, calculate the total impedance of the circuit which is given by.Calculate the total phase angle for the circuit θ = tan – 1(XL/ R).

When a series RC circuit is connected to a constant voltage at t 0 the current passing through the circuit at t 0 is?

What is the current in the circuit at t = 0? Explanation: At t = 0, switch S is closed. Since the capacitor does not allow sudden changes in voltage, the current in the circuit is i = V/R = 20/10 = 2A.

Do appliances use electricity when plugged in but not in use?

The short answer is yes! A variety of different electronic devices and appliances, including televisions, toasters, lamps, and more, when plugged in, can consume electricity even when they’re turned off.

How does a capacitor affect the initial and final voltage across the resistor?

The larger the capacitor , the slower the charge/discharge rate. If a voltage is applied to a capacitor through a series resistor, the charging current will be highest when the cap has 0 Volts across it. (i.e. when it is first connected the full voltage will be across the resistor).

What happens to a DC series motor when started on no load condition?

Therefore if the DC Series Motor is started at No Load then the speed of DC Series Motor will become dangerously high which will definitely damage the DC Series Motor. In view of this, DC Series Motor shall always be started and operated under load mechanically coupled with it.

What may happen to a series motor if it is connected to power without having a load?

A series motor should never be started at no load. With no mechanical load on the series motor, the current is low, the counter-EMF produced by the field winding is weak, and so the armature must turn faster to produce sufficient counter-EMF to balance the supply voltage. The motor can be damaged by overspeed.

How do you find the impedance of a resistor and capacitor in series?

Ohm’s Law for AC circuits: E = IZ ; I = E/Z ; Z = E/I. When resistors and capacitors are mixed together in circuits, the total impedance will have a phase angle somewhere between 0°- and -90°.

Which of the following devices can be connected in series circuit?

A: Yes, Best Buy is available to haul-away your old TV. A: Yes, Geek Squad is available to install and mount your TV no matter where it was purchased. A: Geek Squad is available to install and mount your TV no matter where it was purchased.

Which is a better brand LG or Samsung?

In terms of sheer pedigree, LG comes out as the better brand. As we’ve said, its OLED televisions are among the very best commercially available sets out there – and on top of that, the webOS smart platform has the stronger reputation.

Who is the best TV manufacturer in the world?

In terms of their TVs, they’re one of the most well-known companies alongside Samsung and LG. While Samsung specializes in LED displays and LG dominates in the world of OLEDs, Sony produces great OLED and LED TVs, but they tend to be more expensive than the competition, and don’t tend to offer the best value.

Which are the devices connected in series in a household circuit?

1 Answer. Fan, Switch, Regulator, etc.

How do you calculate voltage across RL?

Use Ohm’s Law and find the value of the total current: I = V/Z amp. Step 5. Calculate the voltages across resistor R and inductor L by using Ohm’s Law. Since the resistor and the inductor are connected in series, so current in them remains the same.

What is the effect of frequency in the voltage current and phase angle of the circuit explain?

Thus if the frequency of the voltage applied to a series RC circuit is increased, the phase angle decreases.

When the frequency of the applied voltage in a series RC circuit is increased What happens to the capacitive reactance?

In RC circuit, as frequency increases, the capacitive reactance Xc decreases and current proportionally increases in Xc. However, there is no increase or decrease in the current limiting by the resistor.

What are two types of circuits?

There are two types of circuit we can make, called series and parallel. The components in a circuit are joined by wires. If there are no branches then it’s a series circuit. If there are branches it’s a parallel circuit.

When a series R-L circuit is connected to a voltage V at t 0 the current passing through the inductor L at T 0 is?

Explanation: At t = 0+ the current in the circuit is zero. Therefore at t = 0+, i = 0 => 0 = c + 2 =>c = -2.

When an RC series circuit is connected to a DC source what is the voltage on a capacitor after one time constant when?

In an RC circuit connected to a DC voltage source, voltage on the capacitor is initially zero and rises rapidly at first since the initial current is a maximum: V(t)=emf(1−et/RC) V ( t ) = emf ( 1 − e t / RC ) . The time constant τ for an RC circuit is defined to be RC.

What happened to the light bulb in the circuit when the voltage is increased?

Increasing the voltage increases the brightness of the bulb. When a bulb in a series circuit is unscrewed all bulbs in the circuit go out. Increasing the number of bulbs in a series circuit decreases the brightness of the bulbs. In a series circuit, the voltage is equally distributed among all of the bulbs.

When would an open circuit occur?

An open circuit is one in which the flow of electrons has been disrupted by a break in the path. An open circuit can occur as a result of a component failure, a conductor break, or a manual interruption. An open circuit in a series circuit can result in a full loss of current.