Show that the resistance of wire AB is $2.5\,\Omega$.
Wire AB is shown in Fig. 5.1 connected in series with a power supply $E$ and a resistor $R$. The e.m.f. of $E$ is $6.0\text{ V}$ and its internal resistance is negligible. The resistance of $R$ is $2.5\,\Omega$. A second uniform wire CD is joined across the terminals of $R$. CD has length $100\text{ cm}$, diameter $0.18\text{ mm}$ and is made from the same metal as AB. Calculate the current supplied by $E$.
Wire AB is shown in Fig. 5.1 connected in series with a power supply $E$ and a resistor $R$. The e.m.f. of $E$ is $6.0\,\text{V}$ and its internal resistance is negligible. The resistance of $R$ is $2.5\,\Omega$. A second uniform wire CD is connected across the terminals of $E$. CD is $100\,\text{cm}$ long, has diameter $0.18\,\text{mm}$ and is made of the same metal as AB.
Calculate the power transformed in wire AB.
Calculate the potential difference (p.d.) between midpoint $M$ on wire AB and midpoint $N$ on wire CD.