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Electricity
According to Ohm's Law electric potential difference(V) is directly proportional to the product of the current(I) times the resistance(R).

V = I R

The relationship between power (P) and current and voltage is

P = I V

Using the equations above we can also write

P = V2 / R

and

P = I2 R

Resistance of Resistors in Series

The equivalent resistance (Req) of a set of  resistors connected in series is

Req = R1 + R2 + R3 + - - -

Resistance of Resistors in Parallel

The equivalent resistance (Req) of a set of resistors connected in parallel is

1/Req = 1/R1 + 1/R2 + 1/R3 + - - -