Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

The Electromagnetic Force (EMF) is one of the four fundamental forces in physics that unify the Electric Interaction between charges and the Magnetic Interaction between magnetic charges. The electromagnetic force is essentially the result of the interaction between the Electric Field and the Magnetic Field. The following is a detailed explanation of the electromagnetic force and its relationship to electricity and magnetism:The interaction between electric charges Electric field: When an electr

High ground systems (usually referred to as high resistance ground systems) are used mainly for the following reasons:Limit ground fault currentReduce the risk of equipment damageIn high-resistance grounding systems, the ground fault current is limited to a relatively low level. When a ground fault occurs, a smaller fault current flows through the ground path. This low level of fault current has less impact on the thermal stress and electrodynamics of electrical equipment (such as transformers,

In a Star-Delta or Y-delta connection, changing the direction of the motor can be achieved by changing the phase sequence applied to the motor windings. The direction of the motor depends on the power supply phase sequence, that is, the order in which the three phases of the power supply reach the motor winding. The following are the specific operation steps and principles:Star connection (Star/Y connection)Star connection principle: In a star connection, one end of the three windings is connect

Arc Fault Circuit Interrupter (AFCI) and Ground Fault Circuit Interrupter (GFCI) are two different types of circuit breakers that have different functions and uses and cannot be used interchangeably. Here are the differences between them:AFCI (Arc Fault Circuit Breaker) Design purpose:AFCI is primarily used to detect and prevent arc failure, which is an electrical failure due to loose wires or connections that can cause a fire. An arc failure usually occurs when the insulation of a wire is damag

Factors to consider when choosing a batteryWhen choosing a battery, we need to consider the following key factors:Battery typeBattery type is the primary consideration when choosing. Common battery types are lead-acid batteries, lithium batteries, nickel-metal hydride batteries and lithium iron phosphate batteries. Each battery has its own advantages and disadvantages, for example, lead-acid batteries are cheap but have poor battery life, and lithium batteries have a long service life and fast c

The use of Alternating Current Motor (AC Motor) instead of Direct Current Motor (DC Motor) in Electric vehicles (EVs) has some potential disadvantages. Although AC motors have many advantages, in some cases, using AC motors can present some challenges. Here are some of the main drawbacks:Higher cost Inverter cost: AC motors require an inverter (Inverter) to convert the direct current provided by the battery to alternating current. Inverters are expensive to design and manufacture, which increase

It is a common practice to parallel multiple batteries to increase the capacity of the inverter, but it does not directly increase the capacity of the inverter, but increases the overall energy storage capacity of the system. A few concepts need to be clarified here:What is the capacity of the inverter?The capacity of the inverter usually refers to the maximum output power it can provide, that is, how much direct current the inverter can convert into alternating current. The capacity of the inve

Compared with the Modified Sine Wave Inverter, a pure Sine Wave Inverter has obvious advantages in terms of output waveform quality and load adaptability. The following are the main advantages of pure sine wave inverters over improved sine wave inverters:The output waveform quality is higherTrue sine waveA pure sine wave inverter can produce a sinusoidal waveform that is almost consistent with grid power supply, which is the most ideal form of power supply for most electronic devices and househo

There is indeed a correlation between the size of the circuit breaker (which usually refers to its rated current, which is the number of amps) and its strength (which is its ability to protect). The size selection of the circuit breaker should be based on the specifications of the wires in the circuit and the expected maximum load current. Here's a detailed explanation:The relationship between circuit breaker size and strengthProtection abilityThe size (rated current) of the circuit breaker dete

Adding resistance to a circuit will have different effects on voltage and current, depending on how the resistors are connected (series or parallel). The effects of series and parallel resistances on voltage and current are explained below:Effect of series resistanceEffect of currentIn a series circuit, all components share the same current. Therefore, no matter how many resistors are in series in the circuit, the current through each resistor is the same. Increasing resistance does not change t