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(a) State two factors that determine the resistance of metallic conductor.
(b) Explain how a fuse safeguards electrical appliances against excessive currents.
(c) A hair dryer is rated 2.5kW, 240V.
(i) Determine whether a 10A fuse may be suitable for the hair dryer.
(ii) Determine the cost of using the dryer for 3 hours if the cost of electricity is Kshs. 0.80 per kilowatt hour.