Fig. 5.1 depicts a kitchen tap that delivers instant boiling water.
Cold water flows across an electric immersion heater inside the tap.
Water boils at $100\,^{\circ}\text{C}$.
(a)[2]
State the meaning of boiling point.
(b(i))[2]
Calculate the thermal energy generated by the heater in $60\,\text{s}$.
(b(ii))[4]
Calculate the rate at which water at its boiling point leaves the tap.
(c)[3]
1. Explain how the earth wire keeps the user safe.
2. Explain how the fuse protects the circuit.
Worked solution & mark scheme
This 11-mark question has a full step-by-step worked solution and mark scheme. One marking point: “the temperature” …