Basic Electrical Engineering (part-2)

Basic Electrical Formula:

The most common used electrical formulas - Ohms Law and combinations. Common electrical units used in formulas and equations are

Electrical Voltage - Ohm's Law

Ohm's law can be expressed as:

V = R I                        (1a)
V = P / I                      (1b)
V = (P R)^1/2                (1c)

Electric Current - Ohm's Law

I = V / R                      (2a)
I = P / V                      (2b)
I = (P / R)^1/2               (2c)

Electric Resistance - Ohm's Law

R = V/ I                     (3a)
R = V²/ P                   (3b)
R = P / I²                   (3c)

Electric Power

P = V I                      (4a)
P = R I²                    (4b)
P = V²/ R                  (4c)
where
P = power (watts, W, J/s)
V = 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.




Next topic: Basic Electrical Engineering(part-3)


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