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Practical Electronics/Basic Theory/General Formulae

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Charge

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Charge refers to quantities of Electric Charge of an object

1 C = Number of Electrons e

Voltage

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Voltage is defined as Work done on a Charge

Current

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Current is defined as ratio of Charge over Time

I , Current
Q , Charge
t , Time

Resistance

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R , Resistance
V , Voltage
I , Current

Conductance

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G , Conductance
R , Resistance
I , Current
V , Volatge

Reactance

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X = ± j ω T
X , Reactance
ω , Angular of Frequency
T , Time Constant

Impedance

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Z = R + X
Z , Impedance
R , Resistance
X , Reactance

Power

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Power Loss

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P R = I V = =

Power Delivered

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Power Stored

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