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## Electrical Engineering Calculator

Welcome to CALCULATOR EDGE, an online, free Engineering Calculators for Engineers and Students worldwide, Our website features more than few hundred calculators for solving complex equations and formulas in field of Electrical, Mechanical, Chemical, Electronics, Civil, Metallurgy, Oil & Gas, Optical, Plastics, Ceramics, Physics, Maths and many more to come., if you have any questions or difficulty using the calculator. Electrical engineering technology is the largest branch of engineering technology and includes a wide range of sub-subjects,such as inclusion.EducationCareer Electrical Load Calculations For Residential Panel-EET-2021.

Also referred to as: Electrical Engineering Design Manager, Electrical Test Equipment Engineering Manager
Requirements and Responsibilities

Electrical Engineering Manager manages electrical engineering activities within an organization. Implements and maintains policies and procedures for designing, testing, installing, and maintaining electronic equipment or devices. Being an Electrical Engineering Manager reviews and approves new or revised designs, testing or installation procedures. Ensures engineering projects are properly staffed and milestones are achieved. Additionally, Electrical Engineering Manager provides guidance and professional development to team of engineers. Requires a bachelor's degree of electrical engineering. Typically reports to a head of a unit/department. The Electrical Engineering Manager typically manages through subordinate managers and professionals in larger groups of moderate complexity. Provides input to strategic decisions that affect the functional area of responsibility. May give input into developing the budget. Capable of resolving escalated issues arising from operations and requiring coordination with other departments. To be an Electrical Engineering Manager typically requires 3+ years of managerial experience.

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## The most common used electrical formulas - Ohms Law and combinations

Common electrical units used in formulas and equations are:

• Volt - unit of electrical potential or motive force - potential is required to send one ampere of current through one ohm of resistance
• Ohm - unit of resistance - one ohm is the resistance offered to the passage of one ampere when impelled by one volt
• Ampere - units of current - one ampere is the current which one volt can send through a resistance of one ohm
• Watt - unit of electrical energy or power - one watt is the product of one ampere and one volt - one ampere of current flowing under the force of one volt gives one watt of energy
• Volt Ampere - product of volts and amperes as shown by a voltmeter and ammeter - in direct current systems the volt ampere is the same as watts or the energy delivered - in alternating current systems - the volts and amperes may or may not be 100% synchronous - when synchronous the volt amperes equals the watts on a wattmeter - when not synchronous volt amperes exceed watts - reactive power
• kiloVolt Ampere - one kilovolt ampere - kVA - is equal to 1000 volt amperes
• Power Factor - ratio of watts to volt amperes

### Electrical Potential - Ohm's Law

Ohm's law can be expressed as:

U = R I (1a)

U = P / I (1b)

U = (P R)1/2 (1c)

### Electric Current - Ohm's Law

I = U / R (2a)

I = P / U (2b)

I = (P / R)1/2 (2c)

R = U / I (3a)

R = U2/ P (3b)

R = P / I2 (3c)

### Example - Ohm's law

A 12 volt battery supplies power to a resistance of 18 ohms.

I = (12 V) / (18 Ω)

= 0.67 (A)

### Electric Power

P = U I (4a)

P = R I2 (4b)

P = U2/ R (4c)

where

P = power (watts, W, J/s)

U = voltage (volts, V)

I = current (amperes, A)

R = resistance (ohms, Ω)

### Electric Energy

Electric energy is power multiplied with time:

W = P t (5)

where

W = energy (Ws, J) t = time (s)

Alternative - power can be expressed

P = W / t (5b)

Power is consumption of energy by consumption of time.

#### Example - Energy lost in a Resistor

A 12 V battery is connected in series with a resistance of 50 ohm. The power consumed in the resistor can be calculated as

P = (12 V)2 / (50 ohm)

= 2.9 W

The energy dissipated in 60 seconds can be calculated

W = (2.9 W) (60 s)

= 174 Ws, J

= 0.174 kWs

= 4.8 10-5 kWh

#### Example - Electric Stove

An electric stove consumes 5 MJ of energy from a 230 V power supply when turned on in 60 minutes.

The power rating - energy per unit time - of the stove can be calculated as

P = (5 MJ) (106 J/MJ) / ((60 min) (60 s/min))

= 1389 W

= 1.39 kW

The current can be calculated

I = (1389 W) / (230 V)

= 6 ampere

### Electrical Motors

#### Electrical Motor Efficiency μ = 746 Php / Pinput_w (6)

where

μ = efficiency

Php = output horsepower (hp)

Pinput_w = input electrical power (watts)

or alternatively

μ = 746 Php / (1.732 V I PF) (6b)

#### Electrical Motor - Power

P3-phase = (U I PF 1.732) / 1,000 (7)

where

P3-phase = electrical power 3-phase motor (kW)

PF = power factor electrical motor

#### Electrical Motor - Amps

I3-phase = (746 Php) / (1.732 VμPF) (8)

where

I3-phase = electrical current 3-phase motor (amps)

PF = power factor electrical motor

## Related Topics

• Electrical - Electrical units, amps and electrical wiring, wire gauge and AWG, electrical formulas and motors

## Related Documents

### Electrical Engineering Calculators

• 12 Volt Current and Maximum Wire Length - Maximum copper wire length with 2% voltage drop
• Abbreviations According the International Electrotechnical Commission - Conforming abbreviations according IEC
• Aluminum Conductor Characteristics - Characteristics of all-aluminum conductor (AAC)
• Charging Electrical Vehicles - Voltage, Amps and Power - EV - Electrical Vehicle - Charging Stations - Power vs. Amps and Voltage - AC vs. DS - Single Phase vs. Three Phase
• Copper Wire - Electrical Resistance - Gauge, weight, circular mils and electrical resistance
• Electric Circuit Diagram - Template - Use Google Drive to make online shareable electric circuit diagrams
• Electrical Equipment and typical Power Consumption - Typical power consumption and running time for some common electrical equipment
• Electrical Units - Definition of common electrical units - like Ampere, Volt, Ohm, Siemens
• Electromotive Force - e.m.f - Change in electrical potential between two points
• Lead Acid Batteries - Specific gravity and charge of lead acid batteries - temperature and efficiency
• Max Amps in Copper and Aluminum Wire - Maximum current in copper and aluminum wire
• Ohm's Law - Voltage, current and resistance
• Relative vs. Absolute Voltage - Electric circuits and the voltage at any point
• Resistance and Conductance - The reciprocal of electrical resistance is conductance
• Resistivity and Conductivity - Temperature Coefficients for Common Materials - Resistivity, conductivity and temperature coefficients for some common materials as silver, gold, platinum, iron and more
• Resistors - Color Codes Calculator - Color codes for fixed resistors - values and tolerances - online calculator
• Single Phase Power Equations - Single phase electrical power equations
• Single vs. Three Phase AC - Amperage - Convert between single phase (120, 240 and 480 Voltage) and three phase (240 and 480 Voltage)
• Three-Phase Power Equations - Electrical 3-phase equations
• Voltage by Country - Typical voltages and frequencies used for domestic appliances
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