Physics Unit 2 Revision (Higher tier)

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(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
The existing power sockets in the house are wired to the mains electricitysupply using 2.5 mm 2 cable.Use the data in the table to explain why the shower must not be connected tothe mains electricity supply using 2.5 mm 2 cable.............................................................................................................................................................................................................................................................................................................................................................................................................................................................(2)(iii) The circuit connecting the shower to the mains electricity supply mustinclude a residual current circuit breaker (RCCB) and not a fuse.Give two advantages of using a RCCB to protect a circuit rather than a fuse.1 ...........................................................................................................................................................................................................................2 ...........................................................................................................................................................................................................................(2)(Total 10 marks)Sample Question 15
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Page 7 and 8: Cars and braking forcesHow quickly
Page 9 and 10: (c)A car was travelling at 30 m/s.
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Page 21 and 22: Sample Question 10A pupil did an ex
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Page 25 and 26: Sample Question 11Sample Question 1
Page 27 and 28: Mains electricity and safetyIn circ
Page 29: To know what rating of fuse to use
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Physics Unit 2 Revision (Higher tier)

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