V₁, V₂ and V₃ are the p.d. across the 1 Ω, 2 Ω and 3 Ω resistors in the following diagram, and the current is 5A.

Which one of the columns (a) to (d) shows the correct values of V₁, V₂ and V₃ measured in volts?

In the circuit shown below :

The potential difference across the 3 Ω resistor is:

A battery and three lamps are connected as shown:

Which of the following statements about the currents at X, Y and Z is correct?

A wire of resistance R₁ is cut into five equal pieces. These five pieces of wire are then connected in parallel. If the resultant resistance of this combination be R₂, then the ratio is:

Show with the help of diagrams, how you would connect three resistors each of resistance 6 Ω so that the combination has resistance of (i) 9 Ω (ii) 4 Ω