Physics > AQA Question Papers > AQA_A2_Physics_Magnetic_Fields_1QP (All)
AQA_A2_Physics_Magnetic_Fields_1QP
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An electric oven is connected to a 230 V root mean square (rms) mains supply using a cable of negligible resistance. (a) (i) Calculate the peak-to-peak voltage of the mains supply. peak-to-peak vol ... tage = ____________________ V (2) 1 (ii) The resistance of the heating element in the oven at its working temperature is 12 Ω. Calculate the power dissipated by the heating element in the oven. Give your answer to an appropriate number of significant figures. power = ____________________ W (3) (b) In practice the resistance of the cable connecting the oven to the mains supply is not negligible. Each of the two wires connecting the heating element to the mains electricity supply has a length of 3.15 m. Each metre of wire has a resistance of 0.0150 Ω. (i) Explain why the rms voltage across the heating element in the oven will be less than 230 V.... [Show More]
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