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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)

Electric Resistance - Ohm's Law

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)

Electrical engineering calculator program

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

Electrical

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

Basic Electrical Engineering Calculator

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