David Sang Solutions for Chapter: Electric Circuits, Exercise 4: Questions

Use the idea of resistors in series to explain why a long wire has more resistance than a short wire (of the same thickness and material).

Use the idea of resistors in parallel to explain why a thick wire has less resistance than a thin wire (of the same length and material).

What will be the effective resistance of three $60 \mathrm{\Omega }$resistors connected together in parallel?

Two resistors of values $30 \mathrm{\Omega }$ and $60 \mathrm{\Omega }$ are connected in parallel. Calculate their effective resistance.