Answer the following questions related to electrical power in a series circuit:
(a) Define electrical power in an electric circuit.
(b) Write any two alternative formulae for the power dissipated in a resistor of resistance R carrying current I under a potential difference V.
(c) In a series circuit containing several resistors, which electrical quantity remains the same through every resistor? State this explicitly.
(d) Using your answer to part (c), write the general expression for the power Pi dissipated in the ith resistor Ri of a series combination.