There are two types of power supplies: alternating current (AC) and direct current (DC). AC or DC power may be used depending on the electrical requirements of the gadget. For example, if a cell phone needs both AC and DC power, it would use a dual-voltage power supply.
AC power is given off by power stations using large generators that run on steam or diesel fuel. The power is transmitted over long distances through conductors called lines. Power stations usually provide electricity from 100 volts to 240 volts at a frequency of 60 cycles per second. This is called single-phase power. Three-phase power is also available but this is less common.
DC power is produced by small battery-powered devices such as radios and wristwatches. These days, most small electronic devices use AC/DC converters to work with domestic mains power. The main advantage of DC power is that it does not suffer from noise induced by high-frequency fluctuations in voltage that occur with AC power. Also, it cannot cause electromagnetic interference (EMI) that can interfere with other devices. However, these advantages are generally outweighed by the need for larger batteries for DC gadgets compared with their AC counterparts.
The type of power supply needed depends on the electrical requirements of the device you are building.
Power supply transform electricity. There are two types of power supplies: DC-DC and AC-DC. DC-DC power supplies allow you to plug electrical gadgets into automobile outlets or other direct current, or DC, power sources. These power supply, however, are not the most widely utilized. The majority of devices require alternating current, or AC, for proper operation.
AC-DC power supplies convert alternating current (AC) into direct current (DC). They can be further divided into three main categories: linear regulators, switch-mode power supplies, and inverters. Linear regulators produce an almost constant voltage level from a relatively low battery source. They are useful when maximum efficiency is important, such as in cell phones and laptops. Switch-mode power supplies use one or more switches to control how the energy from the AC line is routed to the device's terminals. These supplies are very efficient, but they can only operate on one circuit at a time. Inverters change DC power into AC power. They are used in situations where pure DC is needed, such as in small appliances and office equipment. In general, inverters are less expensive than AC-DC power supplies and are often included as part of a multi-function product that includes both AC and DC power outputs.
The type of power supply used with any given electronic device determines what kinds of batteries it can run off of.
A power supply is an electrical device that provides electricity to a load. All power supplies have a power input connection that takes energy from a source in the form of electric current and one or more power output connections that provide current to the load. The power supply controls the amount of current provided to the load according to requirements of the load and any protection circuitry included in the design of the power supply.
Power supplies can be divided into two main categories based on the source of their power: switch-mode power supplies (SMPS) and linear power supplies. A switch-mode power supply uses a switching mechanism to control the flow of current to the load, while a linear power supply produces a constant voltage level with variable amperage. Some hybrid power supplies use features of both types of power supplies to achieve greater efficiency than either type by itself.
Linear power supplies are used when the output voltage must be held constant despite changes in the load current. As the load demands increase, so does the current drawn from the battery. To keep the output voltage high enough for proper operation of the load, more energy needs to be delivered from the battery. Most batteries have a limited capacity compared to the load, so this type of power supply will eventually run out of juice if not changed. Switch-mode power supplies are used when greater efficiency is desired over a constant load current.
An electrical power supply is a device that supplies energy to electrical or electronic devices. It can be divided into two main categories: direct current (DC) and alternating current (AC). A DC power supply produces a constant voltage no matter how much current is drawn from it. An AC power supply produces a constantly changing voltage, which means it can output more power at lower currents than a DC power supply of the same size. The voltage produced by an AC power source such as a wall socket varies between a high-amperage peak value and a low-amperage off-peak value.
Electrical power is the flow of electrons through a conductor such as a copper wire. Electrical power is generated by any number of different methods, but all methods require force to be applied to the conductor in order to move it and thus generate power. This force may be provided by any number of different mechanisms, but usually it is provided by some type of engine or motor. For example, steam engines, gas turbines, and electric motors all apply force to conductors to generate electricity.
Electricity is the flow of electrons through a conductor such as a copper wire. Electricity is transmitted to homes and businesses across vast distances using power lines.