Physics Unit 2 Revision (Higher tier)

(ii) Explain the difference between an a.c. (alternating current) electricitysupply and a d.c. (direct current) electricity supply.............................................................................................................................................................................................................................................................................................................................................................................................................................................................(2)(c)A householder has a 10.8 kW electric shower installed in the bathroom.(i) Calculate the current drawn from the mains electricity supply by theshower.Write down the equation you use, and then show clearly how you work out youranswer.............................................................................................................................................................................................................................................................................................................................................................................................................................................................Current = .................................... A(2)(ii) The table gives the maximum current that can safely pass through electriccables of different cross-sectional area.Cross-sectionalareain mm 2Maximum safecurrentin amps1.0 11.52.5 20.04.0 27.06.0 34.010.0 46.016.0 62.0