Electrical Engineering

Repository of Electrical engineering checks and calculation templates

Here you can find pre-built calculation and design templates from all kinds of different disciplines and areas. You can use them as is or duplicate them into your own workspaces and make them your own!

Calculation templates

Welcome to CalcTree's template library! Here you can find pre-built calculation and design templates from all kinds of different disciplines and areas

Welcome! This calculator will allow you to input values for voltage and current to produce a power value. This can calculate the total power in a circuit or the power dissipation of particular electrical components. 

Power is the rate of electrical energy transfer per unit of time. It is a fundamental principle in electrical analysis. 

Check out our other calculators to calculate transformer currents, generator fault currents, inductor reactance or other electrical calculations!

DC Power Circuit Calculator

Calctree's DC Power Circuit Calculator calculate the power dissipation of particular electrical components. Try now 

Welcome! This page will use Ohm's Law to calculate voltage in a circuit given current and resistance. 

It can be used to find component-specific voltages or total voltage in a circuit assuming a DC source. 

Ohm's law is the foundation of electrical analysis and, thus, incredibly useful for circuit design.

Ohm's law describes the relationship between voltage, current and resistance. A larger current and resistance give rise to a larger voltage. However, a larger resistance reduces the total current if the voltage is constant. 

To calculate the power dissipated in a circuit, the battery capacity or the full load current in a system, check out our other calculators!

Ohm's Law To Calculate Voltage In a Circuit 

Find specific voltages or total voltage in a circuit using Calctree's Ohm's law calculator. Try now

Welcome to the inductive reactance calculator! This page will use frequency and inductance input parameters to provide a reactance value. Reactance is a property of AC circuit components (inductors and capacitors) that is similar to resistance. The difference is that while resistance opposes the current flow, reactance opposes the change in the current flow. 

When provided with an AC voltage, an inductor will produce a reactance. This reactance depends on the AC source frequency and the inductance value. 

To calculate the reactance of a capacitor, the short circuit current for a cable or the capacity of a battery, check out our other calculators! 

Inductive Reactance Calculator

Our online Inductive reactance calculator will use frequency and inductance input parameters to provide a reactance value. Sign up & try now

Welcome! This page will use the frequency of an AC source and the capacitance value of a capacitor to calculate its reactance. Reactance is an important property of capacitors and inductors that arises due to the changing direction of the current flow in AC circuits. 

Reactance is similar to resistance, with the difference being that resistance describes the opposition to the flow of current, while reactance describes the opposition to the change in the current (which is the case in AC circuits). Let's begin! 

When provided with an AC voltage, a capacitor will produce a reactance. This reactance depends on the AC source frequency and the capacitance value.

To calculate the reactance of an inductor, ohm's law or generator fault current, check out our other calculators!

Capacitive Reactance Calculator

This online capacitive reactance template will use an AC source and the capacitance value of a capacitor to calculate its reactance. Try now

Welcome to the full load current calculation template!

To calculate the full load current of a device or circuit, you will need to know the following information:

The full load current is the amount of current that a device or electrical circuit is rated to carry continuously, without overheating or damaging the conductors. Knowing the full load current of a device or circuit is important to properly size the conductors, overcurrent protection devices, and power supply.

Have you tried our other calculators on inductor reactance, battery capacity or transformer fault current?

Full Load Current Calculator

This full-load current calculator template will calculate the circuit's voltage and the device's or circuit's power rating. Check now

Welcome! This calculator allows you to calculate the generator fault current given a generator power rating, rated voltage, and impedance in base percentage. 

Fault currents can occur in a circuit due for several reasons. Knowing this value can provide valuable information for rectifying and diagnosing problems in a circuit. As well as helping you to make appropriate design choices for electrical components.

Fault currents occur as a result of low-impedance short circuits. As a generator is an electrical machine, it can occur when a short to ground is created, phases are crossed or other similar scenarios. The magnitude of the generator fault current depends on several technical specifications.

To calculate the total power in a circuit and the specific reactance of an inductor or capacitor, check out our other calculators! 

Generator Fault Current Calculator

Our Generator fault current calculator allows you to calculate the generator fault current & provide information for diagnosing problems. Sign up now

Welcome! Calculating generator load current is an important task that ensures that your generator runs at an optimal level and is not overloaded. This is important for maintaining the safety and efficiency of your generator system.

This page will enable you to calculate the generator load current using the following:

The generator load current is the amount of electrical current being drawn from a generator at a given moment. It is typically measured in amperes (A) and is a key factor in determining the efficiency and safety of a generator system.

The load current of a generator is directly related to the power output of the generator. The higher the load current, the more power the generator produces. However, if the load current becomes too high, it can cause the generator to become overloaded, which can lead to reduced efficiency, overheating, and even damage to the generator.

Check out our other calculators to calculate power, battery capacity,  generator fault current or many other parameters!

Generator Load Current Calculator

Online calculate the current load of the generator to ensure that your generator runs at an optimal level. Sign up now

Welcome! This page will allow you to calculate the primary and secondary current of a single or 3 phase transformer and the turns ratio. The key parameters required for calculation will be:

The transformer is a device that transfers electrical energy from one circuit to another through electromagnetic induction. The transformer relies on the principles of Faraday's Law of Electromagnetic Induction, which states that the voltage induced in a conductor is proportional to the rate of change of the magnetic field. We will calculate a transformer's full load current and turns ratio in this template.

The full load current of a transformer is the amount of current that the transformer can carry under normal operating conditions. It is an important parameter to consider when designing a transformer as it determines the conductor's size needed to carry the current.

The turns ratio of a transformer is the ratio of the number of turns of wire on the primary winding of the transformer to the number of turns on the secondary winding. It is an important parameter to consider as it determines the voltage transformation the transformer can perform.

Try out our other calculators to find cable short circuit current, battery capacity and many other EE parameters! 

Transformer Full Load Current and Turns Ratio Calculator

kva of a transformer calculator calculates the primary and secondary current of a single or 3-phase transformer and the turns ratio. Try now

Welcome! This page will allow you to calculate the transformer fault current using the transformer rating in kVa, the voltage rating of the secondary winding and the per unit impedance of the transformer in percentage. Let's begin! 

In a transformer, fault current refers to the amount of current that flows through the transformer when there is a fault or short circuit in the system. This current can be much higher than the normal operating current of the transformer. It can cause damage to the transformer and other electrical equipment if it is not properly protected.

Several types of fault conditions can occur in a transformer, such as a short circuit between the primary and secondary windings, a short circuit between the windings and the transformer's core, or an external short circuit on the secondary side of the transformer. Each of these fault conditions can result in a different fault current magnitude and waveform.

💡Understanding and analysing these fault currents is important to properly design and protect the transformer and the electrical system.

Current Fault Calculator For Transformer 

Calculate the transformer fault current and the transformer rating in kVa, the voltage rating of the secondary winding and more. Click now

Welcome to our load fault current calculator! This page will allow you to find the fault current through the cable to a load given:

Short circuit fault current is the amount of current that flows through a circuit when a short circuit occurs. It is an important factor to consider in electrical engineering, as it determines the size of protective devices such as circuit breakers and fuses.

When a short circuit occurs, the resistance in the circuit drops to nearly zero, causing the current to increase significantly. The short circuit fault current is the maximum current that will flow through the circuit at the point of the fault. Calculating the short circuit fault current is important to ensure that the protective devices are properly sized to handle the high current.

To calculate full load current in a component, a generator, as well as calculating many other parameters, try out our other calculators!

Short Circuit Fault Current Calculator For Cable AS/NZS 3008

Find the problems in the current through the cable to a load given Cable short circuit fault current calculator. Try now

Welcome! This calculator will allow you to calculate an appropriate battery size in Amp-hours given load, supplied voltage, duration, battery type and charge. 

Choosing the most appropriate battery for a circuit is a critical choice in designing a selected circuit. The type of battery also plays a crucial part in implementing this. 

The most important specification of a battery is its current rating. The rated capacity of any battery expresses the average amount of current it releases over a period of time under normal use. For example, a 4000Ah battery can deliver 100 A for 40 hours. 

The type of battery selected also plays an important role in battery size. Lead-acid batteries have a battery rating proportional to their discharge rate. 

Check out our other calculators to calculate inductor reactance, generator fault current, and more! 

Battery Capacity Calculator

The battery capacity calculator will allow you to calculate the correct battery size in Amp-hours given load, voltage, duration & more. Try now 

Welcome to our 3-Phase Power calculation template! This page will enable you to calculate a power value for real, apparent and reactive power in kW, kVA and kVAR units. You will need to know either the line voltage or phase voltage, the phase current/line current and the power factor. Let's begin!  

Figure 1: How industrial and household appliances utilise 3-Phase Power

Three-phase power is a common electrical power transmission method used for high-power applications, such as in power plants, factories, and commercial and residential buildings. In a three-phase system, three alternating current (AC) voltages are generated with a fixed phase difference of 120 degrees between them and are transmitted along three separate conductors. Three-phase systems have several advantages over single-phase systems, including more efficient power transmission, reduced transmission losses, and reduced cost of electrical equipment.

Check out our other calculators to calculate transformer fault current, generator fault current or wire voltage drop! 

3-Phase Power Calculator (real, apparent, reactive)

CalcTree will enable you to calculate a power value for real, apparent & reactive power in kW, kVA and kVAR units. Sign up now

Welcome! This calculator will enable you to calculate the voltage drop across a length of wire using a specified input voltage, rated load current and distance.

Voltage drop due to wires is an important parameter in the design of electrical circuits, especially in high-voltage systems. Controlling and anticipating this voltage drop is essential for building safe and efficient electrical systems. 

Voltage drop is defined as the amount of voltage reduction in an electrical circuit due to resistance. This resistance can be in the form of electrical components such as resistors, inductors or capacitors, but it can also occur due to the electricity carrying wire's internal resistance. 

The voltage drop due to the conductor wire's internal resistance can be calculated as follows: 

Wire Voltage Drop Calculator AS/NZS 3008

This online tool by CalcTree will allow calculating the voltage across a length of wire in a specified input voltage. Check now

Welcome! This page will allow you to calculate the motor speed of an AC induction motor using the supply frequency and the number of pole pairs within the motor. 

Motor speed is an essential parameter in electric motor design. As such, it should be considered carefully. 

AC induction motor speed depends on the supply frequency and the number of pole pairs. To regulate the speed of an AC induction motor, one must vary these two variables to achieve the desired speed. There are also other methods of speed regulation: 

Check out our other calculators to calculate motor torque, transformer fault current or battery capacity! 

AC Induction Motor Speed Calculator

Calculate the RPM of a motor using AC induction motor speed calculator template. Calculate the motor speed of an AC induction. Try now

Welcome! This page will allow you to calculate the full load current of an AC induction motor. It will utilise supply voltage, power rating, power factor, efficiency and the type of phase to calculate a current value in amps. Let's begin!

The full load motor current is the maximum amperage the induction motor windings are designed to draw given ideal conditions (determined by the manufacturer). 

Check out our other calculators on AC induction motor speed and motor torque!

AC Induction Motor Current Calculator (3Ph, 1Ph)

Calculate the total load current of AC induction motors with this template. It will utilize supply voltage, power rating and more. Sign up and try now

Welcome! This page will allow you to calculate motor torque using motor speed and specified power rating. Motor torque, speed and power are directly related and are some of the most important considerations when selecting a motor. 

Calculating the speed and torque will give you an important design parameter when selecting a motor.

The torque output of a motor is the amount of rotational force that the motor develops. Torque is generated differently for different motors (DC, induction, synchronous). See the list below for an explanation of how torque is developed for each type of motor. 

Check out our other calculators on Ohm's Law, Generator Fault Current or AC induction motor speed!

Electric Motor Torque Calculator 

Use this template to calculate motor torque using motor speed. Calculating the speed and torque will give you an important design parameter. Try now

Welcome to our electricity bill calculator! This page will allow you to calculate the specific energy cost of household appliances and electrical machines based on a given cents per kilowatt hour rate! We will provide you with a cost-per-week or monthly rate. 

Your electricity provider charges electricity based on a cents/kWh basis. Knowing how much money your appliances are costing you is an extremely useful piece of information! 

The cost of electricity in dollars per week can be calculated as follows: 

Electricity Bill Calculator

Calculate the billing unit and specific energy cost of appliances and electrical machines. Join now

Welcome! This calculator will allow you to calculate the arcing current value using a range of inputs, such as bolted short-circuit current, system voltage and conductor gap. 

Arc flashes occur when live wires are short-circuited. In the case of high-voltage systems such as those in generators, factories and power stations, this can prove extremely dangerous and hazardous to those in contact with the circuit. 

                                  Arc Flash Blast

Arc flash is the current that flows across the air gap between two conducting wires. It can produce an extremely loud noise, pressure waves and temperatures depending on the voltage The value of the Arc Flash current (according to the 

 standard) can be calculated as follows: level involved. 

Check out our other calculators to calculate various other electrical engineering parameters!

Arc Flash Current Value Calculator

The arc flash calculator will allow you to calculate the arcing current value using a range of inputs. Join CalcTree now 

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