Figure 1 shows the apparatus used to determine the specific latent heat of fusion of ice using an electrical immersion heater.

Suggest one safety precaution needed when using this electrical apparatus in close proximity to water and melting ice.
Practise Edexcel GCSE Physics Heating, specific heat and latent heat with exam-style questions for Foundation and Higher tier. 81 questions, matched to the Edexcel GCSE Physics (1PH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.