Two resistors `R_1 and R_2` are connected in parallel and the main current across the group is I ampere. Find the branch currents.

Two resistors of resistances R_1 and R_2 are connected in series and this group is connected across a voltage source of (V) volts. What are the voltages across R_1 and R_2

A current of 10 Ampere flows through a coil of resistance 100 ohm. A second coil of resistance R ohm is connected across the first coil so that the current through the second coil is 8 amperes. Then the value of R in ohms is