What type of current gives constant voltage

Increasing the voltages the grid transmits electricity reduces this lost power. As the voltage gets higher, the current decreases proportionally because the transmitted electrical power energy per unit time remains the same.

However there is a limit, being that at extremely high voltages kV the electricity begins to discharge resulting in high losses. Efficient transmission saves power companies and consumers a lot of money, which helps reduce pollution since power plants do not need to make up for lost electricity by using more fuel. Other advantages of AC include: [5]. A big advantage of direct current is that it is easier to change the speed of a DC electric motor than it is for an AC one.

This is useful in many applications, such as electric and hybrid cars. Direct current is used in essentially all consumer electronics, since transistors the building blocks of modern electronics rely on it to operate.

Devices that use DC current include cell phones , laptops, TVs and much more. Direct current may also be used to transmit electricity with even greater efficiency than alternating current over extremely large distances by use of HVDC transmission high-voltage direct current. Fossil Fuels. Nuclear Fuels. International Shipping Info. Send Email. Mon-Fri, 9am to 12pm and 1pm to 5pm U.

Mountain Time:. Direct current is a bit easier to understand than alternating current. Rather than oscillating back and forth, DC provides a constant voltage or current. The tank can only push water one way: out the hose. Similar to our DC-producing battery, once the tank is empty, water no longer flows through the pipes. DC is defined as the "unidirectional" flow of current; current only flows in one direction.

Voltage and current can vary over time so long as the direction of flow does not change. In addition, a voltage regulator IC may be used to provide a more stable output better than the discrete components. The SMPSs are used to provide more stable and efficient constant voltages. Compared to the linear regulators, the SMPSs is the best, but are more expensive. A constant voltage is usually used on circuits that require a steady voltage supply for their efficient operation.

For example, the constant voltage drivers are used for paralleled LED strip lighting due to the circuit design, which produces the most balanced current over the independent output channels. Click Here for our Current Statement Dismiss. What is Constant Voltage? Figure 1: Ideal constant voltage behavior Some of the characteristics of an ideal constant voltage source are: Zero internal resistance Maintaining the same voltage regardless of variation in the amount of current drawn by load, No current flows when the circuit is not loaded open circuited.

How a constant voltage source works For a voltage source to provide a constant voltage, it must have a very low internal resistance, preferably zero — even though this might not be practically possible.