Question

Three identical light bulbs are connected in series, then are disconnected and arranged in parallel. For each of the scenarios below indicate what changes (if any) take place

A. Total resistance of the circuit
B. Total current of the circuit
C. Power dissipated by the circuit
D. Voltage used by one of the light bulbs
E. Resistance of one of the light bulbs

Answer 1

how far do you get? Do you not have any ideas? If not, you'd better review the textbook where it discusses this.

To start,
A
series: R = r+r+r
parallel: 1/R = 1/r + 1/r + 1/r