David Sang and Graham Jones Solutions for Chapter: Kirchhoff's Laws, Exercise 9: Questions

Three resistors of resistances $20 \mathrm{\Omega }, 30 \mathrm{\Omega }$ and $60 \mathrm{\Omega }$ are connected together in parallel. Select which of the following gives their combined resistance: $110 \mathrm{\Omega }, 50\mathrm{\Omega }, 20\mathrm{\Omega },10\mathrm{\Omega }$ 
(No need to do the calculation)

In the circuit in Figure the battery of e.m.f.$10 \mathrm{V}$ has negligible internal resistance. Calculate the current in the $20 \mathrm{\Omega }$ resistor shown in the circuit.

Determine the current drawn from the battery in Figure.

What value of resistor must be connected in parallel with a $20 \mathrm{\Omega }$ Resistor so, that their combined resistance is$10 \mathrm{\Omega }$? 

You are supplied with a number of$100 \mathrm{\Omega }$ resistors. Describe how you could combine the minimum number of these to make a $250 \mathrm{\Omega }$ resistor.

Calculate the current at each point (A-E) in the circuit shown in Figure 9.21.