A smart home security hub is connected to the UK mains electricity supply, which has a nominal potential difference of 230 V230\text{ V}230 V.
The current in the hub is 0.08 A0.08\text{ A}0.08 A. Calculate the power of the hub.
Use the equation: power=potential difference×current\text{power} = \text{potential difference} \times \text{current}power=potential difference×current
Calculate the energy transferred by the hub when a charge of 650 C650\text{ C}650 C flows through it.
Use the equation: energy transferred=charge flow×potential difference\text{energy transferred} = \text{charge flow} \times \text{potential difference}energy transferred=charge flow×potential difference
A technician is repairing the hub with its protective outer casing removed, exposing the live wire connection inside. Describe the difference between the hazard and the risk in this scenario for the technician.
Practise AQA GCSE Physics Domestic uses and safety with exam-style questions for Foundation and Higher tier. 13 questions covering Direct and alternating potential difference and Mains electricity, matched to the AQA GCSE Physics (8463) 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.