In the circuit shown below :

The potential difference across the 3 Ω resistor is:

If two resistors of 35 Ω and 15 Ω are joined together in series and then placed in parallel with a 40 Ω resistor, the effective resistance of the combination is :

The diagram below shows part of a circuit:

If this arrangement of three resistors was to be placed by a single resistor, its resistance should be :

A battery and three lamps are connected as shown:

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

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?