Explain what the term electromotive force means.
State the relationship between the current $I_B$ in the battery, the current $I_1$ in the $18\,\Omega$ resistor and the current $I_2$ in the $30\,\Omega$ resistor.
State an equation connecting the e.m.f. $E$ of the battery with the potential difference $V_1$ across the $18\,\Omega$ resistor and the potential difference $V_2$ across the $30\,\Omega$ resistor.
Calculate the current in the battery.
Calculate the potential difference (p.d.) across the $18\,\Omega$ resistor.
Calculate the power produced in the $18\,\Omega$ resistor.
State Ohm’s law and describe one restriction on this law.
State the relationship between the resistance $R$ and the length $l$ of a wire when the cross-sectional area is constant.
State the relationship between the resistance $R$ and the cross-sectional area $A$ of a wire when the length is constant.
State the colours of the bands on the $30\,\Omega$ resistor: first band, second band, third band.